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
________occurs whenever there is an imbalance between myocardial oxygen supply and demand. 
Select and explain. 
A. Sudden Death, B. Stable angina, C. Unstable angina, D. Myocardial infarction
B: Stable angina
Answer: B: Stable angina 
Explanation: None