This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
Senile plaques in Alzeihmer's diseasae are rich in- 
Select and explain. 
A. Amyloid, B. Tau protein, C. ApoE, D. Neuroglia
A: Amyloid
Answer: A: Amyloid 
Explanation: *Pathology: neuritic plaques composed in pa of Ab amyloid, derived from amyloid precursor protein (APP); neurofibrillary tangles composed of abnormally phosphorylated tau protein. Ref Harrison20th edition pg 2567