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': "Mechanism of action of tacrolimus is ? \nSelect and explain. \nA. Inhibition of transcription of IL 2, B. Inhibition of translation of IL 2, C. Inhibition of calcineurin, D. Both 'a' and 'c'", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Both 'a' and 'c'", 'role': 'assistant'}]