This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': "Embolism of posterior cerebral artery leads to memory' impairment because of damage to \nSelect and explain. \nA. Hippocampal gyrus, B. Angular gyrus, C. Premarginal area, D. Superior temporal gyrus", 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Hippocampal gyrus # Occlusion of the distal PCA causes> Infarction of the medial temporal and occipital lobes.> Contralateral Homonymous hemianopia with macula sparing is the usual manifestation.> Occasionally, only the upper quadrant of visual field is involved.> If the visual association areas are spared and only the calcarine cortex is involved, the patient may be aware of visual defects.> Medial Temporal lobe and hippocampal involvement maycause an acute disturbance> In memory, particularly if it occurs in the dominant hemisphere.', 'role': 'assistant'}]