This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Drug not used in prinzmetal angina is? 
Select and explain. 
A. Propranolol, B. Propranolol, C. Nitritesrites, D. Isosorbide dinitrate
A: Propranolol
Answer: A: Propranolol 
Explanation: Ans. is 'a' i.e., Propranolol o P-blocker's are contraindicated because they cause constriction of coronary aery due to unopposed a mediated vasoconstriction.