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Zorluk: ZorChaining Conditional Statements

According to the new international guidelines for clinical pharmaceutical trials, a trial advances to Phase III only if it demonstrates long-term efficacy. Furthermore, unless a trial is monitored for secondary adverse effects, it cannot demonstrate long-term efficacy. Every trial that is monitored for secondary adverse effects must be subject to a rigorous independent ethics review. Finally, a newly developed treatment contains synthetic bio-markers only if it advances to Phase III.

Based on the guidelines above, which one of the following must be true?

  1. A
    If a trial does not advance to Phase III, then it will not be monitored for secondary adverse effects.
  2. B
    Demonstrating long-term efficacy guarantees that a newly developed treatment contains synthetic bio-markers.
  3. Any newly developed treatment that contains synthetic bio-markers is subject to a rigorous independent ethics review.Cevap
  4. D
    If a trial is subject to a rigorous independent ethics review, then the treatment being tested must contain synthetic bio-markers.
  5. E
    Most trials that are subject to a rigorous independent ethics review will eventually demonstrate long-term efficacy.

Cevap

Any newly developed treatment that contains synthetic bio-markers is subject to a rigorous independent ethics review.
The correct answer accurately connects the beginning of the logical chain to the end. The stimulus establishes: (1) Synthetic bio-markers require Phase III; (2) Phase III requires long-term efficacy; (3) Long-term efficacy requires monitoring for secondary effects; and (4) Monitoring requires an independent ethics review. Linking these together yields: Synthetic bio-markers → Ethics review.

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1
Translate the conditional rules regarding Phase III and efficacy.
Rule 1: Advances to Phase III → Demonstrates long-term efficacy. Rule 2: 'Unless monitored, cannot demonstrate efficacy' translates to 'If it demonstrates efficacy → Monitored for secondary effects'.
Accurate translation of indicator words like 'only if' and 'unless' is required to establish the logical relationships.
2
Translate the remaining rules and combine all statements into a single transitive chain.
Rule 3: Monitored for secondary effects → Independent ethics review. Rule 4: Contains synthetic bio-markers → Advances to Phase III. Combined Chain: Contains synthetic bio-markers → Advances to Phase III → Demonstrates long-term efficacy → Monitored for secondary effects → Independent ethics review.
Creating a unified logical sequence makes it possible to see the direct relationship between the first sufficient condition and the final necessary condition.
3
Evaluate the options against the established logical chain.
The chain proves that if a treatment contains synthetic bio-markers, it must ultimately be subject to an independent ethics review.
This confirms that the correct answer is a valid deduction drawn from linking the first term to the last term.

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Chaining Conditional Statements
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