13923
During the latter exposure , fish were monitored for survival till all fish had died , and ( during the first 8h of this exposure ) for changes in whole - body Na levels and lipid peroxidation ( LPO ) .
 Chemical: Na
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: Na 
Answer:
 Chemical: Na