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
Non-selective beta blocker is contraindicated in diabetes because 
Select and explain. 
A. Hyperglycemia, B. Hypoglycemic unawareness, C. Tachycardia, D. Hypotension
B: Hypoglycemic unawareness
Answer: B: Hypoglycemic unawareness 
Explanation: Hypoglycemia stimulates sympathetic system l/t palpitations which are neutralized by sympatholytics like beta blockers. Ref: HL Sharma 3rd ed.