23013
Methyl mercury , held in the school laboratory for experimental purpose , may be a source of poisoning .
 Chemical: Methyl mercury
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: Methyl mercury 
Answer:
 Chemical: Methyl mercury