2369
Acetylcholinesterase ( AChE ) activity has been used to evaluate the exposure of mollusk bivalves to organophosphates , carbamate pesticides , and heavy metals .
 organophosphates, carbamate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 organophosphates, carbamate