Which is a common heat-sensitizing medication?

The correct answer is a medication that is commonly associated with causing heat sensitivity or heat-related reactions. Sudafed, which contains pseudoephedrine, works as a decongestant and may lead to increased body temperature and potential heat sensitivity due to its stimulant effects on the body. This is particularly important in situations where firefighters are exposed to high heat conditions, as it can affect their performance and health.

Tylenol, aspirin, and ibuprofen are primarily pain relievers or anti-inflammatories and do not generally influence body heat regulation or sensitivity in the same manner that Sudafed can. Those medications are more focused on reducing fever, alleviating pain, or inflammation rather than causing heat sensitivity.