This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: RCT, Trials, Subject name: Social & Preventive Medicine
Cessation experiment is a type of: 
Select and explain. 
A. Coho study, B. Case control study, C. RCT, D. Cross sectional study
C: RCT
Answer: C: RCT 
Explanation: Types of RCTs: Clinical trials Preventive trials Risk factors trials Cessation experiments Trial of etiological agents Evaluation of health services.