4538
Memory facilitation and stimulation of endogenous nerve growth factor synthesis by the acetylcholine releaser PG - 9 .
 Chemical: acetylcholine; Chemical: PG - 9
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: acetylcholine, PG - 9 
Answer:
 Chemical: acetylcholine; Chemical: PG - 9