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
Morphine ? 
Select and explain. 
A. Stimulates CTZ zone of medulla, B. Stimulates respiratory centre of medulla, C. Depresses CTZ zone of medulla, D. None of the above
A: Stimulates CTZ zone of medulla
Answer: A: Stimulates CTZ zone of medulla 
Explanation: Ans. is 'a' i.e., Stimulates CTZ zone of medulla