3952
Recent evidence suggests that alpha 7 nAChR subtypes , which can be activated by an endogenous cholinergic tone , comprising acetylcholine and the alpha 7 nAChR agonist choline , play an important role in subchronic pain and inflammation .
 Chemical: acetylcholine; Chemical: choline
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: acetylcholine; Chemical: choline