There is a growing concern about the release of a particular gas into the atmosphere form the permafrost of Arctic region. Which one of the following is that gas?

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Q: 36 (IES/2016)
There is a growing concern about the release of a particular gas into the atmosphere form the permafrost of Arctic region.
Which one of the following is that gas?
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question_subject: 

Science

question_exam: 

IES

stats: 

0,120,70,50,5,120,15

keywords: 

{'methane': [0, 0, 0, 5], 'particular gas': [0, 0, 0, 1], 'carbon monoxide': [3, 0, 1, 1], 'atmosphere': [1, 1, 4, 7], 'arctic region': [0, 0, 0, 3], 'sulfur dioxide': [0, 0, 0, 2], 'gas': [9, 1, 9, 27], 'permafrost': [0, 0, 0, 1]}