19176
PURPOSE : Cholinesterase inhibitors and memantine are the mainstay of pharmacological intervention for the cognitive symptoms of Alzheimer ' s disease ( AD ) .
 Chemical: memantine
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: memantine 
Answer:
 Chemical: memantine