13356
This decrease may originate from lower Cl ( - ) levels measured in eels exposed to both stressors .
 Chemical: Cl ( - )
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: Cl ( - ) 
Answer:
 Chemical: Cl ( - )