**Core Concept**
The CURB-65 criteria is a clinical prediction rule used to assess the severity of pneumonia and predict the risk of mortality. It takes into account five variables: Confusion of new onset, Uremia, Respiratory rate ≥ 30 breaths/min, Blood pressure ≤ 60 mmHg systolic or ≤ 90 mmHg diastolic, and age ≥ 65 years.

**Why the Correct Answer is Right**
The CURB-65 criteria are a well-established tool for clinicians to assess the severity of pneumonia and guide treatment decisions. Each component of the CURB-65 criteria has been validated to predict mortality in patients with pneumonia. The criteria are widely used in clinical practice and have been shown to improve patient outcomes.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not part of the CURB-65 criteria.
**Option B:** This option is not part of the CURB-65 criteria.
**Option D:** This option is not part of the CURB-65 criteria.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the CURB-65 criteria are not a substitute for clinical judgment. Clinicians should use their discretion when applying the criteria and consider other factors that may affect patient outcomes.

**Correct Answer: D.**