12. A doctor puts his stethoscope on a patient's chest over the 5th intercostal space and hears a swishing
sound. Which of the following conditions is the
most likely working diagnosis for the patient's condition?
A. Common Carotid artery blockage
B. hypertension
C. Incompetent A-V valves
D. Incompetent S-L valves
E. Tachycardia