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The Origin of Carcinogens

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Medical News Today, David McNamee, June 10, 2014
The following is an article (“Is hair dye to blame for hairdressers’ increased risk of bladder cancer?”) that was published in Medical News Today.

Based on the passage, what caused hairdressers to be exposed to aromatic amines?

A

Hair dyes.

B

Hair-waving products.

C

Hair-straightening products.

D

Hair cuts.