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
FK-506 is used in - 
Select and explain. 
A. Organ transplant, B. Bronchial asthama, C. Diabetic diarroea, D. Chemotherapecutic agent
A: Organ transplant
Answer: A: Organ transplant 
Explanation: Ans. is 'a' i.e., Organ transplant Fk - 506 is tacrolimus.