The incidence of cancer in a remote rural area was found to be higher than expected. Of the following possible reasons for the finding, which is the most likely?
A) Fluoridated drinking water
B) Industrial waste in the drinking water
C) Nitrate-contaminated drinking water
D) Nitrate-contaminated vegetables such as spinach and beets
C
Feedback:
Contamination of drinking water with nitrates from fertilizers has been associated with increased risk of non-Hodgkin's lymphoma, but vegetables high in nitrates (such as spinach and beets) have not. Fluorides have not been proved to be associated with cancer. If the area is truly remote, industrial wastes are unlikely to be present in the drinking water.
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