This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'All of the following can worsens angina except \nSelect and explain. \nA. Dipyramidol, B. Oxyphedrine, C. Thyroxine, D. Sumatriptan', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Refer katzung 11e p283 Dipyramidole can result in coronary steal phenomenon and can worsen the angina Thyroxine is thyroid hormone and get cause tachycardia which can precipitate angina by increasing the cardiac work Sumatriptan can cause coronary vasoconstriction and can cause angina Oxyfedrine is a selective Beta 2 agonist. It is claimed to improve myocardial metabolism so that hea sustain hypoxia better', 'role': 'assistant'}]