Cause to effect progression is seen in all except ?: (A) Case control study, (B) Ecological study, (C) Coho study, (D) Randomized control trial
Answer is A. Ans. is 'a' i.e., Case control study o Case-control study proceeds backward from effect to cause, i.e. disease has already occured in subjects.o All other studies proceeds forward from cause to effect, i.e. disease has not occured in subjects.