In which city did John Snow trace the source of a cholera outbreak?
Paris
Moscow
New York
London
Answer
London was the city where John Snow traced the source of a cholera outbreak. In 1854, there was a major outbreak of cholera in the Soho district of London. At the time, it was not known what caused cholera. Snow suspected that the source of the outbreak was contaminated water from the Broad Street pump.
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