## Core Concept
Carey Coombs Murmur is a type of short, mid-diastolic murmur associated with rheumatic fever. It is a consequence of inflammation and mitral valve leaflet thickening leading to a functional stenosis. This murmur is typically seen in the context of acute rheumatic fever.

## Why the Correct Answer is Right
The Carey Coombs Murmur is characterized by being a short, mid-diastolic murmur best heard at the apex. It is associated with rheumatic fever and is thought to result from inflammation of the mitral valve leaflets and the underlying myocardium. This leads to a stiffening of the valve leaflets, causing a functional obstruction to blood flow during diastole.

## Why Each Wrong Option is Incorrect
- **Option A:** Typically, the Carey Coombs Murmur is described as being short and mid-diastolic. If an option suggests it is a systolic or a long diastolic murmur, it would be incorrect because it accurately describes characteristics not attributed to the Carey Coombs Murmur.
- **Option B:** If an option states that the Carey Coombs Murmur is associated with rheumatic fever, it would be correct and not the answer we're looking for since the question asks what is false.
- **Option C:** Without specific details on the options, we consider general incorrect statements. For example, if an option claims the murmur is best heard at the right sternal border or is a late diastolic murmur, it would be incorrect because the Carey Coombs Murmur is typically best heard at the apex and is mid-diastolic.
- **Option D:** Similarly, if an option suggests the murmur is due to mitral regurgitation or another valvular issue not directly related to rheumatic inflammation causing functional stenosis, it would be incorrect.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the Carey Coombs Murmur is a benign, functional murmur associated with rheumatic fever and does not typically indicate severe valvular disease. It often resolves with treatment of the rheumatic fever.

## Correct Answer: D.