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': 'All can cause release of histamine except? \nSelect and explain. \nA. D-TC, B. Morphine, C. Propranolol, D. Vancomycin', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Propranolol", 'role': 'assistant'}]