This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'Non-selective beta blocker is contraindicated in diabetes because \nSelect and explain. \nA. Hyperglycemia, B. Hypoglycemic unawareness, C. Tachycardia, D. Hypotension', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hypoglycemia stimulates sympathetic system l/t palpitations which are neutralized by sympatholytics like beta blockers. Ref: HL Sharma 3rd ed.', 'role': 'assistant'}]