In a study begun in 1965, a group of 3,000 adults in baltimore were asked about alcohol consumption. the occurrence of cases of cancer between 1981 and 1995 was studied in this group. this is an example of:

A prospective cohort study

Explanation:

A prospective cohort study -

It is a longitudinal study which a group of people with certain differences are studied , in order to determine how various factors affect the rate of the outcomes .

This method is adapted for studying various diseases , this method is a long run method , which is done for years to have complete and brief knowledge  .

hence , from the question , Cancer study is done on the 3,000 adults of Baltimore , showing the example of  a prospective cohort study .

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