This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Memory impairment occurs in embolism of posterior cerebral aery because of damage to : 
Select and explain. 
A. Hipppocampal gyrus, B. Superior temporal gyrus, C. Prefrontal gyrus, D. Angular gyrus
A: Hipppocampal gyrus
Answer: A: Hipppocampal gyrus 
Explanation: Answer is A (Hippocampal gyrus): `Medial temporal lobe and Hippocampal involvement may cause an acute disturbance in memory paicularly of it occurs in the dominant hemisphere' - Harrisons 16th