###Rationale: (Refer: K. Park’s Textbook of Preventive and Social medicine, 24th edition, pg no: 74, 76, 87)
THE INFORMATION IN THE QUESTION IS INSUFFICIENT TO CONCLUDE

It may be a Quasi randomized trial or it can be just clinical trial where the patient may serve as his control
Since association is determined, hence it can be indirectly understood as there are 2 groups
There is an intervention in the study – so it is not a case control or cohort study or cross sectional study
There is no mention of randomization of intervention in the groups which is the heart of RCT

###Answer: OPTION C IS CORRECT.
###Question: In a prospective study, 1200 patients were randomly selected to study the effect of a new drug. The drug will be given for 5 years and its association with cataract will be studied. What tyepe of study is this?
###Options:
A. Case control study
B. Cohort study
C. Randomized clinical trial
D. Cross-sectional study
