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
Which of the following doesn't worsen angina 
Select and explain. 
A. >Sumatriptan, B. >Oxyfedrine, C. >Dipyrickuriole, D. >Thyroxine
B: >Oxyfedrine
Answer: B: >Oxyfedrine 
Explanation: Oxyfedrine Drugs that exacerbate angina : Alpha blocker Beta blockers withdrawl Ergotamine Excessive thyroxine Hydralazine Methysergide Minoxidil Nifedipine Oxytocin Sumatriptin' Vasopressin Dipyridamole - Dipyridamole is a vasodilator. It was originally developed as an antianginal agent. But it tends to worsen angina due to "coronary steal" phenomenon. Oxyfedrine - Oxyfedrine was found to depress the tonicity of coronary vessels, increase the coronary circulation volume, the oxygen uptake by the hea and also to exe a positive inotropic and chronotropic action. - It does not precipitate angina. - In fact it is used as an antianginal drug.