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
Period Prevalence is 
Select and explain. 
A. No of cases in a given point of time, B. No of cases in a given year, C. No of cases over a period of years mentioned, D. Incidence of no of cases during a given period
B: No of cases in a given year
Answer: B: No of cases in a given year 
Explanation: None