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
Propanolol can be used in all of the following conditions EXCEPT: 
Select and explain. 
A. Thyrotoxicosis, B. Variant angina, C. Migraine, D. Hypeention
B: Variant angina
Answer: B: Variant angina 
Explanation: ref;KD Tripathi 7the edition pharmacology (page no;147,149) Propranolol exacerbates variant (Prinzmetal' s) angina due to unopposed a mediated coronary constriction. uses of propranolol are Hypeension, Angina pectoris, Migraine, thyrotoxicosis, Pheochromocytoma, Glaucoma, MI, Cardiac Arrhythmias,