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
[{'content': 'Memory impairment is most likely to occur in - \nSelect and explain. \nA. Downs Syndrome, B. Alkaptonuria, C. Attention deficit disorder, D. Conduct disorder', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]