**Core Concept:** A computer controlled injection system is a device or method that uses electronics to precisely deliver a medication or substance based on programmed parameters. In the context of this question, we are considering automated injection systems used in medicine or healthcare settings.

**Why the Correct Answer is Right:**
Correct Answer: **D. Syringe Pump**

A syringe pump is a computer-controlled injection system that precisely delivers a medication or substance by controlling the flow rate and duration of infusion. It ensures accurate dosing and prevents overdosing or underdosing, thus ensuring safety and efficacy. Syringe pumps are commonly used in healthcare settings for administering medications, fluids, or chemotherapy drugs to patients.

**Why Each Wrong Option is Incorrect:**

A. **Option A (Infusion Pump):** While infusion pumps also control the rate of fluid administration, they do not specifically mention the computer control aspect. Infusion pumps are manual or semi-automated devices, which can lead to errors or inconsistencies in medication administration.

B. **Option B (Autoinjector):** An autoinjector is a device used for self-administration of medications, typically for autoimmune disorders or allergy treatments. It is not specifically a computer-controlled injection system used in healthcare settings.

C. **Option C (Patient Monitoring):** Patient monitoring refers to tracking and recording vital signs or other physiological parameters, not an injection system.

D. **Option D (Syringe Pump):** As mentioned earlier, a syringe pump is a computer-controlled injection system that ensures accurate medication administration.

**Clinical Pearl:** Syringe pumps are crucial in preventing errors and ensuring patient safety when administering medications or fluids. They are widely used in intensive care units, neonatal intensive care units, and other clinical settings.

**Correct Answer:** **D. Syringe Pump**