Answer:
a. Sulfonamides.
Explanation:
Sulfonamides drugs are used to treat infections preventing the growth of bacterias, it is an antibiotic. It was discovered in the '30s but due to its potential side effects, the use of them has decreased. Some of the side effects apart from the ones mentioned in the question are dizziness, diarrhea, skin rash, tiredness, and nausea.