This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
Which of the following drug is used as diagnostic tool? 
Select and explain. 
A. Cevimeline, B. Vedolizumab, C. Tensilon, D. Sacubitril
C: Tensilon
Answer: C: Tensilon 
Explanation: Tensilon also called -edrophonium -used to differentiate myasthenia and cholinergic crisisRef: Katzung 13th ed. Pg 116