type of study design

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Rates of prostate cancer were compared to those exposed to caloric restriction and those that were not exposed to such deprivation.

I have a list to select from:
Cohort
Cross sectional x
Case series
case control
experimental x
ecological x

Im sure its not ecological, cross sectional, experimental.

Im leaning toward Cohort: group pf people with a common chracateristic (prostate concer?) ...healthy people followed overtime to determine incidence of symptoms...exposed vs. non exposed

Could this be case series? Im not too sure about the definition of a case series design to be honest.

Im certain that it cant be case control either because we are not comparing exposure history to Case AND Controls..

HELP!

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