15477
The API is calculated for two different CO2 / CH4 separation case scenarios : " bulk separation " and " natural gas purification " .
 Chemical: CO2; Chemical: CH4
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, CH4 
Answer:
 Chemical: CO2; Chemical: CH4