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': "'C' wave in JVP is due to- \nSelect and explain. \nA. Atrial contraction, B. Tricuspid valve bulging into right atrium, C. Right atrial filling, D. Rapid ventricular filling", 'role': 'user'}, {'content': "Answer: B \nExplanation: Answer is B (Tricuspid valve bulging into right atrium) The 'C' Wave is a positive wave produced by the bulging of tricuspid valve into the right atrium during right Ventricular isovolumetric systole and by impact of the carotid aery adjacent to the jugular vein.", 'role': 'assistant'}]