This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Organic mental disorders, Subject name: Psychiatry
Biological Amnesia is 
Select and explain. 
A. Presenile Dementia, B. Lack of interest, C. Opioid drug addiction, D. Hypothyroidism
A: Presenile Dementia
Answer: A: Presenile Dementia 
Explanation: Thiamine deficiency, hypoglycemia, hypoxia (including carbon monoxide poisoning), and herpes simplex encephalitis all have a predilection to damage the temporal lobes, paicularly the hippocampi, and thus can be associated with the development of amnestic disorders. The below image show major causes of amnestic disorders. Reference: Kaplan and Sadock's synopsis of psychiatry, 11th edition, page 719.