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Which is the most reliable type of observational study for investigating the link between diet and cancer?

Which is the most reliable type of observational study for investigating the link between diet and cancer?

Q. Which is the most reliable type of observational study for investigating the link between diet and cancer?

A.            Randomised controlled trial

B.            Prospective study

C.            Ecological study

D.            Case-control study

Answer: Prospective study

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