This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2018, Subject name: Pharmacology
Which of the following drug must be sold by retail only on production of a prescription by a registered medical practitioner? 
Select and explain. 
A. Schedule H, B. Schedule G, C. Schedule X, D. Schedule M
A: Schedule H
Answer: A: Schedule H 
Explanation: Schedule H: Drugs which can be sold only with prescription. On the strip of drug a long red line is present. Rx is written on the top right corner. NRx- is written on Narcotic (habit forming) drugs. XRx- not available for general market, only given under special conditions where health care provider can give the drug. OTC- Over The Counter drugs can be given without prescription.