system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
True about aetiopathogenesis of Alzheimers disease-a) Absence of tau proteinb) Involvement of Apolipoprotein Ec) Preseneline-1and 2 involved  d) Mutation in chromosome 21e) Preseneline 2 is not involved
assistant
The correct answer is  None