This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'JVP wave with absent y descent and prominent X wave is seen in \nSelect and explain. \nA. Restrictive cardiomyopathy, B. Cardiac tamponade, C. Constrictive pericarditis, D. Right ventricular failure', 'role': 'user'}, {'content': 'Answer: B \nExplanation: JVP: the y descent is abolished due to an increase in intrapericardial pressure, preventing diastolic filling of the ventricles (cardiac tamponade causes an increase in both central venous pressure and pulmonary aery occlusion pressure). Cyanosis and pulmonary oedema may occur. Ref Davidson 23rd edition pg 334', 'role': 'assistant'}]