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: Physiology
[{'content': "Isovolumic relaxation phase of the cardiac cycle ends with \nSelect and explain. \nA. Peak of 'C' waves, B. Opening of AV valve, C. Closure of semilunar valve, D. Beginning of 'T' wave", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cardiac cycle events\n1.\xa0\xa0\xa0 AV valves open – \na.\xa0\xa0\xa0\xa0 End of isovolumetric relaxation\nb.\xa0\xa0\xa0 Start of rapid filling phase\nc.\xa0\xa0\xa0\xa0 ECG- end of T wave\nd.\xa0\xa0\xa0 JVP- Y wave (V-Y descent)\n2.\xa0\xa0\xa0 AV valves closure-\na.\xa0\xa0\xa0\xa0 End of diastole\nb.\xa0\xa0\xa0 Beginning of isovolumetric contraction\nc.\xa0\xa0\xa0\xa0 ECG- R wave later half\nd.\xa0\xa0\xa0 JVP- End of X descent\n3.\xa0\xa0\xa0 Semilunar valves open\na.\xa0\xa0\xa0\xa0 End of isovolumetric contraction\nb.\xa0\xa0\xa0 Ejection phase starts\nc.\xa0\xa0\xa0\xa0 ECG- ST segment\nd.\xa0\xa0\xa0 JVP- the peak of ‘c’ wave\n4.\xa0\xa0\xa0 Semilunar valve closure\na.\xa0\xa0\xa0\xa0 Systole ends\nb.\xa0\xa0\xa0 Isovolumetric relaxation starts\nc.\xa0\xa0\xa0\xa0 ECG- T wave later half', 'role': 'assistant'}]