M Prep | MCAT 2015 Question of the Day - Prep, Practice Questions, and More!

Q:

A river pollutant is suspected of causing higher cancer rates in populations living along the river. What type of studies would be appropriate for understanding the relationship between the pollutant and the cancer rate?

I. Longitudinal observational study
II. Randomized controlled trial
III. Case-control study

A

III only

B

I and III only

C

II only

D

I and II only