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
This sound is produced during the closure of the semilunar valves. 
Select and explain. 
A. lubb, B. dupp, C. lubb dupp, D. lubb duppshhh
B: dupp
Answer: B: dupp 
Explanation: B: The second heart sound can be represented by dupp. It occurs at the beginning of ventricular diastole and results from the closure of the semilunar valves.
A: The first heart sound can be represented by the syllable lubb. It occurs at the beginning of ventricular systole and results from closure of the AV valves.