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': 'Which of the following is an Alpha la adrenergic blocker which give symptomatic relief in BPH? \nSelect and explain. \nA. Tamsulosin, B. Prazosin, C. Oxazocin, D. Dolazoline', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Alpha 1A receptor is predominantly found in bladder base and prostate. Tamsulosin is a uroselective alpha1 blocker effective for symptomatic relief in BPH. Prazosin is a highly selective alpha 1 blocker having alpha1: alpha 2 selectivity ratio 1000:1. It blocks alpha 1 receptors in bladder trigone and prostate and improves urine flow and reduces residual urine in bladder in a case of BPH.', 'role': 'assistant'}]