This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sympathetic System, Subject name: Pharmacology
The only reliable symptom of hypoglycemia in a patient on beta blocker therapy is 
Select and explain. 
A. Tremor, B. Sweating, C. Tachycardia, D. Palpitations
B: Sweating
Answer: B: Sweating 
Explanation: * All the symptoms of hypoglycemia are blocked by beta blockers except sweating as it has cholinergic innervation * Beta blockers (non selective) are contraindicated in : ABSOLUTE C/I Pheochromocytoma Decompensated hea failure symptomatic bradycardia AV block Asthma RELATIVE C/I Peripheral vascular disease