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: Physiology
Maximum blood flow to Coronaries occur during? 
Select and explain. 
A. Early pa of systole, B. Systole proper, C. Early pa of diastole, D. Diastole proper
C: Early pa of diastole
Answer: C: Early pa of diastole 
Explanation: In each cardiac cycle 80% cbf occurs during diastole and the remaining 20% of cbf occurs during systole. Ref: page no363 Textbook of physiology Volume 1 AK Jain 7th edition