Identify the Drugs
- Antacid: Ranitidine is a commonly used antacid, so A-III is correct.
- Antihistamine: Seldane (terfenadine) is an antihistamine, so B-II is correct.
- Tranquilizer: Serotonin affects mood and is a neurotransmitter, but for tranquilizers, the example should be related to tranquilizing action. Here, C-I corresponds to Serotonin.
- Antibiotic: Chloramphenicol is an antibiotic, so D-IV is correct.
Hence, the correct matching is:
A-III, B-II, C-I, D-IV.