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': 'A wave in JVP is due to ? \nSelect and explain. \nA. Atrial systole, B. Atrial diastole, C. Ventricular systale, D. Ventricular diastole', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Atrial systole", 'role': 'assistant'}]