11351
Hydrogen sulfide ( H ( 2 ) S ) is the third endogenous signaling gasotransmitter , following nitric oxide and carbon monoxide .
 Chemical: Hydrogen sulfide; Chemical: H ( 2 ) S; Chemical: nitric oxide; Chemical: carbon monoxide
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: Hydrogen sulfide, H ( 2 ) S, nitric oxide, carbon monoxide 
Answer:
 Chemical: Hydrogen sulfide; Chemical: H ( 2 ) S; Chemical: nitric oxide; Chemical: carbon monoxide