20945
Effects of salinity stress on Bufo balearicus and Bufo bufo tadpoles : Tolerance , morphological gill alterations and Na ( + ) / K ( + ) - ATPase localization .
 Chemical: Na ( + ); Chemical: K ( + )
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 ( + ), K ( + ) 
Answer:
 Chemical: Na ( + ); Chemical: K ( + )