This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'Which of the following drug is used as a diagnostic tool? \nSelect and explain. \nA. Cevimeline, B. Vedolizumab, C. Tensilon, D. Sacubitril', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Tensilon also called -edrophonium test - used to differentiate myasthenia and cholinergic crisis. Ref: Katzung 13th ed. Pg 116', 'role': 'assistant'}]