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': "Dale's vasomotor reversal is due to - \nSelect and explain. \nA. Alpha blocker, B. Beta blocker, C. ACH inhibitor, D. All of the above", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Alpha blocker o In Dale's vasomotor reversal Neurotransmitter --> Adr Blockade --> a - receptors Stimulation --> [32-receptors o Re-reversal of vosomotor reversal is due to propranolol ((3-blockers).", 'role': 'assistant'}]