Dysentery is caused by untreated sewage in streams and rivers. If researchers measured this in the human population and found higher rates than average, it could be used as evidence for leakage from the sewage treatment plant.
B is incorrect because mesothelioma is a type of cancer that is mainly caused by exposure to asbestos. It does not result from contaminated drinking water.
C is incorrect because respiratory problems, such as asthma, can be affected by elevated levels of tropospheric ozone. They are not linked to contaminated drinking water.
D is incorrect because malaria is a parasitic disease caused by bites from infected mosquitoes, not contaminated drinking water, and is found most commonly in sub-Saharan Africa.
