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 continuous murmur is heard in all of the following conditions except: 
Select and explain. 
A. Ventricular septal defect with aoic regurgitation, B. Patent ductus aeriosus, C. Coronary aeriovenous fistula, D. Venous hum
A: Ventricular septal defect with aoic regurgitation
Answer: A: Ventricular septal defect with aoic regurgitation 
Explanation: Answer is A (Ventricular septal defect with Aoic Regurgitation) Ventricular septal defect with Aoic Regurgitation does not produce a continuous murmur Patent Ductus Aeriosus produces a continuous murmur by the presence of a high to low pressure shunt Coronary AV fistula also produces a continuous murmur by the presence of a high to low pressure shunt Venous hum produces a continues murmur by rapid flow of blood Venous hum is a continues murmur usually audible over the medial aspect of the right supraclavicular fossa with the patient upright (Harrison)