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 Tubocurarine is \nSelect and explain. \nA. Cholinesterase inhibitor, B. Cause membrane depolarisation, C. Competitive antagonist of acetylcholine receptor, D. Inhibit opening of chloride channels', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Tubocurarine is a non depolarizing muscle relaxant that competitively blocks action of Acetylcholine on its receptors.', 'role': 'assistant'}]