**Core Concept**
The Mini Mental Status Examination (MMSE) is a widely used, standardized tool for assessing cognitive function in patients, particularly those with suspected dementia or delirium. It evaluates various cognitive domains, including orientation, attention, memory, language, and visuospatial skills. The MMSE scores range from 0 to 30, with higher scores indicating better cognitive function.

**Why the Correct Answer is Right**
The MMSE assesses cognitive function by evaluating a patient's ability to perform various tasks, such as identifying objects, following commands, and recalling words. Each task is assigned a specific score, and the total score is calculated by summing up these individual scores. The maximum score is 30, which is achieved when a patient demonstrates perfect cognitive function in all domains. The MMSE is a reliable and efficient tool for clinicians to quickly assess cognitive status and identify potential cognitive impairments.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the MMSE score range is not 0 to 100, but rather 0 to 30.
**Option B:** This option is incorrect because it does not provide a valid score range for the MMSE.
**Option C:** This option is incorrect because the MMSE score range is not 0 to 50, but rather 0 to 30.

**Clinical Pearl / High-Yield Fact**
The MMSE is a crucial tool for clinicians to quickly assess cognitive function in patients, particularly those with suspected dementia or delirium. However, it is essential to remember that the MMSE has limitations and should not be used as the sole diagnostic tool for cognitive impairments. A comprehensive diagnostic evaluation, including laboratory tests and imaging studies, is often necessary to confirm a diagnosis.

**Correct Answer:** D. 30.