Okay, let's tackle this question. The patient can't speak but can write. Hmm, speech and writing involve different brain areas. Broca's area is responsible for speech production. If that's damaged, you get Broca's aphasia—non-fluent speech, but comprehension is okay. But writing is still possible because it's a different motor function. The primary motor cortex for the hand (precentral gyrus) is involved in writing. So the lesion must be in Broca's area. The other options would affect different functions. Like, Wernicke's area affects comprehension, so that's not it. The primary motor cortex for the face would affect speech, but if it's just Broca's, the muscles are fine. The angular gyrus is more about reading and writing, but writing is intact here. So the correct answer is Broca's area.

**Core Concept**
This question tests knowledge of **Broca's aphasia** and the **anatomical localization of speech production**. Broca's area (inferior frontal gyrus, Brodmann area 44/45) is critical for speech articulation. Lesions here cause non-fluent speech with preserved writing, due to disconnection between motor planning and execution.

**Why the Correct Answer is Right**
Broca's area is in the **dominant hemisphere's inferior frontal gyrus**. Damage here disrupts the motor sequencing of speech (via connections to the primary motor cortex) but spares the motor pathways for writing (controlled by separate motor areas). Patients exhibit **Broca's aphasia**: effortful, telegraphic speech, yet intact comprehension and written expression.

**Why Each Wrong Option is Incorrect**
**Option A:** Lesions in the **primary motor cortex (precentral gyrus)** cause contralateral hemiparesis, including slurred speech from facial weakness, but writing would also be impaired.
**Option B:** **Wernicke's area (superior temporal gyrus)** lesions cause fluent **Wernicke's aphasia** with poor comprehension and nonsensical speech, not muteness with preserved writing.
**Option C:** **Angular gyrus** damage impairs reading/writing (alexia/dysgraphia), contradicting the patient’s ability to write.

**Clinical Pearl / High-Yield Fact**
**"Speech is Broca, comprehension is Wernicke."** Broca’s aphasia = **non-fluent speech, intact writing**; Wernicke’s aphasia = **fluent speech, poor comprehension**. Always correlate motor deficits with cortical/motor pathway anatomy.

**Correct Answer: B. Inferior frontal gyrus**

✓ Correct Answer: A. Brocas area