1755
Five healthy male subjects inspired air for 20 min and then 5 % CO2 / 95 % O2 for 30 min , of which the first 10 min was used to achieve a steady - state end - tidal CO2 measurement .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities:  
Answer:
 None