**Core Concept**
The clinical presentation suggests a **stroke**, specifically a **middle cerebral artery (MCA) stroke**, given the combination of motor and sensory deficits on one side of the body and **homonymous hemianopia**, which indicates involvement of the visual pathway behind the optic chiasm. This pattern of deficits is characteristic of a lesion in the MCA territory.

**Why the Correct Answer is Right**
The **middle cerebral artery (MCA)** is the most likely artery involved because it supplies a significant portion of the lateral surface of the brain, including the motor and sensory cortices for the face and limbs, as well as the optic radiations, which can lead to homonymous hemianopia if damaged. The MCA also supplies the internal capsule, where motor and sensory tracts are closely packed, explaining the patient's weakness and sensory loss.

**Why Each Wrong Option is Incorrect**
**Option A:** Would be incorrect because it doesn't match the typical clinical presentation provided.
**Option B:** Similarly, doesn't align with the described deficits.
**Option C:** Not consistent with the pattern of weakness and sensory loss.
**Option D:** Does not correspond to the clinical scenario.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the **middle cerebral artery** is the largest cerebral artery and is frequently involved in strokes, leading to significant morbidity. Its occlusion can result in a wide range of deficits, including motor, sensory, and visual disturbances.

**Correct Answer:** D. Middle Cerebral Artery