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': "True about Alzheimer's disease -a) Mutation in APP geneb) Autoantibodyc) Aluminium is a risk factor  d) Viral infection has increased riske) Hereditary \nSelect and explain. \nA. abc, B. ad, C. acd, D. bde", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]