This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Adrenergic System, Subject name: Pharmacology
[{'content': 'BETA-blockers are used in all, EXCEPT \nSelect and explain. \nA. Hypertension, B. Thyrotoxicosis, C. Variant angina, D. All of the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Variant angina [Ref: K.D.T. 5th/e page 127\\We all know that attacks of variant angina occur due to coronary vasospasm.So, the drugs which relieve coronary vasospasms will used in variant angina (C.C.B.'S, Nitrates) b blockers are contraindicated in these patients because b blockers, instead of dilating the coronary arteries constrict the coronary arteries (due to unopposed a mediated constriction).Remember, b blockers are useful in classical angina. (They cause favourable redistribution of blood)Uses of b blocker: -HypertensionCardiac arrhythmiasMyocardial infarctionEssential tremorCHFGlaucomaDissecting aneurysmHOCMPheochromocytomaThyrotoxicosisAngina pectoris (classical)MigraineAnxiety", 'role': 'assistant'}]