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': 'At the end of isometric relaxation phase : \nSelect and explain. \nA. Atrioventricular valves open, B. Atrioventricular valves close, C. Corresponds to peak of "C" wave in JVP, D. Corresponds to T wave in ECG', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Atrioventricular value open', 'role': 'assistant'}]