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
Interferon gamma is used for treatment of - 
Select and explain. 
A. HBV, B. HCV, C. Osteopetrosis, D. Both HBV and HCV
C: Osteopetrosis
Answer: C: Osteopetrosis 
Explanation: Ans. is 'c' i.e., Osteopetrosis o Interferon alfa-2b and alfa-2a are used in --> chronic hepatitis B and C, and in some malignancies. o Interferon beta-la is used in multiple sclerosis. o Interferon gamma-lb is used in chronic granulomatous disease and osteopetrosis.