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
True regarding orphan drug is 
Select and explain. 
A. Rare drug for common disease, B. Used rarely, C. Used for rare diseases, D. Used for orphans
C: Used for rare diseases
Answer: C: Used for rare diseases 
Explanation: Orphan drugs are used for rare diseases(orphan diseases)-affecting less than 2 lakh people.oraphan drug used to treat orphan disease for orphan patient. Eg: N acetylcysteine, Deferiprone, Fomepizole,Anagrelide, erythropoietin. Ref: K.D.Tripati.7th ed. Pg 5