Which of the following is a Vitamin?

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Q: 148 (SSC/NA)

Which of the following is a Vitamin?

question_subject: 

Science

question_exam: 

SSC

stats: 

0,3,4,3,3,1,0

keywords: 

{'riboflavin': [2, 0, 0, 0], 'keratin': [1, 1, 0, 0], 'insulin': [4, 0, 0, 0], 'adrenalin': [1, 0, 2, 0]}