A region in Jizan is reported to have high prevalence of Diarrhea. People living in the area are using tube well water, Tap water, and bottle water for drinking purpose. You are contemplating that people using “well water” are more prone to develop diarrheal diseases. Ministry of health give you six months to complete the study. What type of study design you like to plan?
A. Cross-sectional study 

B.Case-Control study 

C.Cohort study 

D.RCT 

E. CIT