Step 1: Concept
Drugs are classified based on the level of professional supervision required for their sale.
Step 2: Meaning
OTC (Over-The-Counter) drugs are those that can be sold without a prescription from a Registered Medical Practitioner.
Step 3: Analysis
Antacids, anti-pyretics (fever reducers), and some anti-inflammatories are generally safe for self-medication. Anti-hypertensives (blood pressure meds) require precise diagnosis and monitoring by a doctor due to potential severe side effects.
Step 4: Conclusion
Anti-hypertensive medications are prescription-only and are not included in the OTC category.
Final Answer: (A)