This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other Analytical Studies, Subject name: Social & Preventive Medicine
All are analytical studies except- 
Select and explain. 
A. Prevalence study, B. Case control, C. Field trials, D. Coho
C: Field trials
Answer: C: Field trials 
Explanation: Analytical studies consists of : Cross sectional/prevalence study Ecological study Case control study Coho study Experimental study consists of : RCT Field trial Community Trial Clinical trial