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
[{'content': 'a\' wave in ,JVP is seen in - \nSelect and explain. \nA. Will be large when atria contracts against resistance, B. Filling of ventricles, C. It is followed by "V" waves, D. ↓in inspiration', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]