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
Contraindications of beta blockers are 
Select and explain. 
A. Asthma, B. Myocardial infarction, C. Hypeension, D. Arrhythmia
A: Asthma
Answer: A: Asthma 
Explanation: Ref:KD Tripathi pharmacology 7th edition (page.no: 146) the beta blocker is contraindicated in asthma because of beta 2 blocking effect (beta 2 agonist cause bronchodilation). Uses of beta blockers are Hypeension, Myocardial infarction, Pheochromocytoma, Cardiac arrhythmias, Thyrotoxicosis, MIGRAINE, essential tremors etc