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: Psychiatry
A/E are true regarding Alzheimer's disease. 
Select and explain. 
A. Gradually progressive, B. Abrupt onset acute exacerbation, C. Episodic memory, D. All
B: Abrupt onset acute exacerbation
Answer: B: Abrupt onset acute exacerbation 
Explanation: B i.e. Abrupt onset acute exacerbation