## Core Concept
The phrase "res ipsa loquitar" is a Latin expression that translates to "the thing speaks for itself." In medical and legal contexts, it refers to a doctrine that infers negligence from the very nature of an accident or injury.

## Why the Correct Answer is Right
The correct answer, D. The thing speaks for itself, accurately reflects the meaning of "res ipsa loquitar." This doctrine is applied in cases where the injury or accident could not have occurred without negligence. For example, if a surgical instrument is left inside a patient, it is assumed that the medical staff was negligent, as such an occurrence is preventable and indicates a breach in the standard of care.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is blank and does not provide any information.
- **Option B:** This option is also blank and does not provide any information.
- **Option C:** Similarly, this option is blank and does not offer any relevant information.

## Clinical Pearl / High-Yield Fact
A key point to remember is that "res ipsa loquitar" is often used in the context of medical malpractice. It helps in establishing a presumption of negligence on the part of the healthcare provider, which can be crucial in legal proceedings.

**Correct Answer: D. The thing speaks for itself.**