17725
This enzyme shows a good catalytic activity for the CO2 hydration reaction , comparable to that of the human ( h ) isoform hCA I .
 Chemical: CO2
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: CO2 
Answer:
 Chemical: CO2