A) opening of semilunar, bicuspid and tricuspid valves
B) closure of semilunar, bicuspid and tricuspid valves
C) opening of tricuspid and bicuspid valves
D) closure of bicuspid and tricuspid valves
Correct Answer: B
Solution :
The lubb - dup sound is produced due to closure of semilunar, bicuspid and tricuspid valves which prevents back flow of blood.
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