This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Risk factor intervention trials for coronary hea diseases are all, EXCEPT: 
Select and explain. 
A. Stanford -Three Community Study, B. Noh Kerelia Project, C. Lipid Research Clinics Study, D. Single Risk Factor Intervention Trial (SR-FIT)
D: Single Risk Factor Intervention Trial (SR-FIT)
Answer: D: Single Risk Factor Intervention Trial (SR-FIT) 
Explanation: Multiple Risk Factor Intervention Trial (MRFIT) in the US is an example of this. Onslow diet/smoking intervention study is another famous trial. Ref: Park's textbook of Preventive and Social Medicine, 21st edition, page-343