Based on the title "The Road to Aspirin," the section likely focuses on the development and history of aspirin, which may include details about its ingredients and formulation rather than information on cold medicines, Nobel Prizes, ancient Egyptians, or the timeline of medicine testing.
Thus, the correct response would be:
which ingredients are used in cold medicines.
However, to be precise regarding the actual content of the "Making Medicine" article, it would be advisable to review the specific section to ensure accurate context.