Final answer:
False, John Grant did not link the cholera epidemic to contaminated water supplies; it was John Snow who did so during the 1854 outbreak in London, as he is considered the father of epidemiology.
Step-by-step explanation:
The statement is false. It was not John Grant but John Snow who conducted the classic study that linked the cholera epidemic to contaminated water supplies. In 1854, Snow tracked the source of a cholera outbreak in London and demonstrated the transmission of cholera bacteria via drinking water. His work was instrumental in refuting the miasma theory of disease transmission, which posited that diseases were spread through the air, and he is known as the father of epidemiology.
During the 1854 cholera outbreak, Snow's detailed mapping of cholera cases and his investigation into the water sources led to the discovery that the water from the Broad Street pump was contaminated with sewage. This ultimately paved the way for significant improvements in public health and sanitation practices. The removal of the pump's handle by local authorities, based on Snow's advice, was a critical public health intervention that resulted in the containment of the epidemic.