This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
A pharmaceutical agent that has been developed specifically to treat a rare medical condition (affecting fewer than 200,000 people): 
Select and explain. 
A. Orphan Drug, B. Primary Drug, C. Rare Drug, D. Pioneer Drug
A: Orphan Drug
Answer: A: Orphan Drug 
Explanation: An orphan drug is a pharmaceutical agent that has been developed specifically to treat a rare medical condition (affecting fewer than 200,000 people).