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
A 35 year old athlete has height 184 cm., arm span 194 cm., pulse rate 64/min., BP 148/64 mm Hg. Chest auscultation reveals long diastolic murmur over right 2nd intercostal space on routine examination. The probable diagnosis is : 
Select and explain. 
A. Aoic regurgitation, B. Atrial septal defect, C. Ebstein anomaly, D. Coarctation of aoa
A: Aoic regurgitation
Answer: A: Aoic regurgitation 
Explanation: Answer is A (A.R.): Arm span greater than height is suggestive of Marfan's syndrome. Aoic regurgitation (A.R.) is a feature associated with Marfans as well as consistent with a diastolic murmur is second right intercostal space.