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
[{'content': 'Tacrolimus belong to which class of drug ? \nSelect and explain. \nA. Calcineurin inhibitor, B. mTOR inhibitor, C. Hypoxathine inhibitor, D. Inosine inhibitor', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Calcineurin inhibitor", 'role': 'assistant'}]