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
Which of the following also known as prevalence study 
Select and explain. 
A. Cohort study, B. Case control study, C. Cross - sectional study, D. Ecological study
C: Cross - sectional study
Answer: C: Cross - sectional study 
Explanation: None