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
Continuous murmur is found in 
Select and explain. 
A. AS combined with AR, B. Systemic A V fistula, C. PDA with reversal f shunt, D. All
B: Systemic A V fistula
Answer: B: Systemic A V fistula 
Explanation: Answer is B (Systemic A V fistula) Aoopulmonary window, systemic AV fistula and ruptured sinus of valsalva are associated with continuous murmurs caused by high to low pressure shunting of blood.