A 53yo had a dental extraction after which he recently had a mitral valve prolapse, high temp of 39C, cardiac failure and new cardiac murmur. What is the single most likely dx?

The key is D. Infection. [Infective endocarditis (IE) is defined as an infection of the endocardial surface of the heart which may include one or more heart valves, the mural endocardium, or a septal defect. Its intracardiac effects include severe valvular insufficiency, which may lead to intractable congestive heart failure and myocardial abscesses. If left untreated, IE is almost inevitably fatal.Dental extraction is a risk factor for infective endocarditis].