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': 'Which one of the following is characteristic of mitral valve prolapse syndrome - \nSelect and explain. \nA. Rough mid diatolic murmur, B. Collapsing pulse, C. Lound first hea sound, D. Mid systolic click', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Early diastolic murmurs sta at the same time as S2 with the close of the semilunar (aoic & pulmonary) valves and typically end before S1. Common causes include aoic or pulmonary regurgitation and left anterior descending aery stenosis. Mid-diastolic murmurs sta after S2 and end before S1. They are due to turbulent flow across the atrioventricular (mitral & tricuspid) valves during the rapid filling phase from mitral or tricuspid stenosis.characteristcs of mitral valve prolapse Late diastolic (presystolic) murmurs sta after S2 and extend up to S1 and have a crescendo configuration. They can be associated with AV valve narrowing.They include mitral stenosis, tricuspid stenosis, myxoma, and complete hea block Ref Davidson 23rd edition pg 435', 'role': 'assistant'}]