Question: a study is performed to assess whether there is an association between exposure to second hand smoke in infancy and delayed development. Fifty children with

a study is performed to assess whether there is an association between exposure to second hand smoke in infancy and delayed development. Fifty children with delayed development and fifty with normal development are selected for investigation. Parents are asked whether their children were exposed to second hand cigarette smoke in infancy or not. This study is an example of a:

A.prospective cohort study

B.retrospective cohort study

C. case control study

D. clinical trial

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