question_subject:
Science
question_exam:
CDS-I
stats:
0,118,36,10,7,19,118
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]}