question_subject:
Science
question_exam:
CDS-II
stats:
0,30,16,30,6,10,0
keywords:
{'limewater milky': [0, 0, 0, 2], 'carbon dioxide': [2, 0, 5, 6], 'nitrogen dioxide': [3, 0, 1, 8], 'gas': [9, 1, 9, 27], 'carbon monoxide': [3, 0, 1, 1], 'ammonia': [0, 1, 0, 2]}