Read the following passage:
Modern industrial dry-type transformers are increasingly replacing traditional liquid-filled units in commercial facilities primarily because their solid-cast epoxy resin insulation eliminates severe fire and environmental contamination hazards. Unlike oil-immersed transformers, dry-type systems contain no combustible fluids that could ignite or rupture during severe electrical fault conditions. While liquid units offer slightly superior thermal dissipation and lower initial purchase costs, dry-type units reduce facility insurance premiums, eliminate the need for exterior containment dikes, and permit direct indoor placement close to electrical loads. Consequently, despite higher manufacturing costs, heightened fire safety and reduced structural regulations make dry-type transformers the preferred choice for indoor commercial power distribution.
Statement: The assertion that dry-type transformers eliminate the need for exterior containment dikes represents the central main idea of the passage.
Answer: Answer