**Core Concept**
The question tests knowledge of **visual pathway anatomy** and **neuro-ophthalmology**, specifically the effects of lesions on visual fields and pupil reactions.

**Why the Correct Answer is Right**
A lesion producing **incongruous homonymous hemianopia** indicates damage to the **temporal lobe** or **optic tract**, but when combined with **Wernicke's hemianopic pupil**, it points towards an optic tract lesion. The optic tract carries fibers from the ipsilateral temporal hemiretina and contralateral nasal hemiretina, and a lesion here can cause incongruous homonymous hemianopia due to the partial crossing of fibers.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it would typically cause congruous homonymous hemianopia.
**Option B:** Incorrect as lesions here usually result in different visual field defects.
**Option D:** Incorrect because it doesn't typically cause the specific combination of visual field defect and pupil reaction described.

**Clinical Pearl / High-Yield Fact**
Remember, **Wernicke's hemianopic pupil** is a key sign of an optic tract lesion, characterized by a pupil that reacts poorly to light shone from the side of the hemianopia, helping to differentiate it from other visual pathway lesions.

**Correct Answer:** C. Optic Tract