This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Pharmacology, Subject name: Pharmacology
[{'content': 'Drugs used for rare disease are known as: \nSelect and explain. \nA. Orphan drugs, B. Rare drugs, C. Over the counter drugs, D. Emergency drugs', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Orphan drugsOrphan drug are specific drugs for treatment of rare diseases (orphan disease). Due to limited sale of the drug, manufacturer of the drug cannot recover its cost.WHO defines a disease as orphan or rare if it affects 6.5-10 out of every 10,000 people.No unanimous acceptable definition in India. However, Organization for Rare Diseases in India (ORDI) defines a rare disease as one that affects 1 in 5000 people or lessIn US, a disease is orphan if it affects less than 2,00,000 people at a given point of time', 'role': 'assistant'}]