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
The following drug inhibits histamine release 
Select and explain. 
A. D tubocurare, B. Morphine, C. Suxamethonium, D. Ketotifin
D: Ketotifin
Answer: D: Ketotifin 
Explanation: Ketotifen, nedocromil are mast cell stabilizers inhibiting the release of histamine.remaining all options given are histamine releasersRef: KD Tripathi 7th ed pg 229