Which one of the following gases is supporter of combustion?

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Q: 98 (CDS-I/2014)

Which one of the following gases is supporter of combustion?

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,207,71,25,16,30,207

keywords: 

{'gases': [0, 0, 5, 12], 'combustion': [0, 0, 0, 1], 'carbon dioxide': [2, 0, 5, 6], 'oxygen': [3, 0, 1, 0], 'hydrogen': [0, 0, 1, 3], 'nitrogen': [1, 1, 0, 2], 'supporter': [0, 0, 0, 1]}