Final answer:
The most likely location of infarct given the symptoms of right homonymous hemianopsia and right hemiparesis is the left Posterior Cerebral Artery (PCA).
Step-by-step explanation:
A 40-year-old male patient presents with right homonymous hemianopsia and right hemiparesis. He is unable to read, but can communicate through writing. The correct answer to this question is C. Left PCA which indicates the Posterior Cerebral Artery on the left side of the brain. The symptoms such as right homonymous hemianopsia and right hemiparesis indicate that the left hemisphere of the brain is affected. This is because the left hemisphere controls the right side of the body and homonymous hemianopsia (visual field loss on the same side of both eyes) are consistent with a lesion in the visual pathways in the opposite hemisphere. Additionally, the ability to write but not read suggests an intact left posterior cerebral artery region, ruling out a left middle cerebral artery (MCA) stroke, which would more likely present with aphasia if the dominant hemisphere is involved.