Which finding, on clinical examination of the pulse, suggests a diagnosis of hypertrophic obstructive cardiomyopathy (HOCM)?

The key is D. Pulsusbisferiens. [Pulsusbisferiens, is a sign where, on palpation of the pulse, a double peak per cardiac cycle can be appreciated. Bisferious means striking twice. Classically, it is detected when aortic insufficiency exists in association with aortic stenosis, but may also be found in hypertrophic obstructive cardiomyopathy].