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: Medicine
In angina pectoris-during exertion: 
Select and explain. 
A. Always associated with loss of consciousness, B. Readily responds to oral nitroglycerin, C. Best treated by intravenous morphine, D. Administration of CO2 hastens recovery
B: Readily responds to oral nitroglycerin
Answer: B: Readily responds to oral nitroglycerin 
Explanation: None