## Core Concept
The Systemic Inflammatory Response Syndrome (SIRS) is a clinical condition characterized by a systemic inflammatory response to an insult, which can be infectious or non-infectious. The diagnosis of SIRS is based on specific clinical criteria.

## Why the Correct Answer is Right
The correct criteria for SIRS include:
- Body temperature greater than 38°C (100.4°F) or less than 36°C (96.8°F).
- Heart rate greater than 90 beats per minute.
- Tachypnea, with more than 20 breaths per minute; or, an arterial partial pressure of carbon dioxide less than 4.3 kPa (32 mmHg).
- White blood cell count either greater than 12,000 cells per cubic millimeter (mm³) or less than 4,000 cells/mm³; or the presence of more than 10% immature neutrophils (bands).

## Why Each Wrong Option is Incorrect
To accurately address this question, the specific options (A, B, C, D) need to be provided. However, given the context that the question pertains to SIRS diagnostic criteria and without the explicit details of each option, a general approach to evaluating incorrect statements regarding SIRS criteria is provided:

- **Option A:** If this option inaccurately represents one of the SIRS criteria (e.g., suggesting a heart rate of 100 beats per minute as a threshold), it would be incorrect because the established criterion is a heart rate greater than 90 beats per minute.
- **Option B:** Similarly, if this option misrepresents another criterion (e.g., suggesting a body temperature of 39°C as the threshold), it would be incorrect based on the established criterion of greater than 38°C or less than 36°C.
- **Option C:** Any misrepresentation of the respiratory rate or the arterial partial pressure of carbon dioxide would make this option incorrect if it does not align with more than 20 breaths per minute or an arterial partial pressure of carbon dioxide less than 4.3 kPa (32 mmHg).
- **Option D:** If this option suggests a white blood cell count threshold that does not align with the established criteria (greater than 12,000 cells/mm³ or less than 4,000 cells/mm³), it would be incorrect.

## Clinical Pearl / High-Yield Fact
A key point to remember is that SIRS can be caused by a variety of conditions, not just infections. This includes severe trauma, burns, pancreatitis, and ischemia. The presence of SIRS does not necessarily imply an infectious process, but rather a systemic response to an insult.

## Correct Answer: D.