5973
Recent evidence suggests that clearance of A beta by microglia / macrophages via the phagocytic pathway is defective in AD , which can contribute to the accumulation of A beta in the brain .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None