This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Guillian Barre syndrome & Alzheimer's disease, Subject name: Medicine
Which of these cells is often malfunctioning in Alzheimer's disease? 
Select and explain. 
A. Microglia, B. Radial glia, C. Dendrites, D. Oligodendrocytes
A: Microglia
Answer: A: Microglia 
Explanation: Alzheimer's disease characterized by: * A ss amyloid deposition * Taupathy * Malfunctioning of microglial cells which play role in phagocytosis & security in brain. IOC - Functional MRI DOC - DONEPEZIL