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Which one of the following is an environment-related disorder with the correct main cause?

A)  Black lung disease (pneumoconiosis) found mainly in workers in stone quarries and crushers.

B)  Blue baby disease (methemoglobinemia) due to heavy use of nitrogenous fertilizers in the area.

C)  Non-Hodgkin's lymphoma found mainly in workers involved in the manufacture of neem- based pesticides.

D)  Skin cancer mainly in people exposed to benzene and methane.