This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Screening, Subject name: Social & Preventive Medicine
All are true about incidence, except- 
Select and explain. 
A. Numerator includes new cases, B. Denominator includes population at risk, C. Does not include population at risk, D. It is a rate
C: Does not include population at risk
Answer: C: Does not include population at risk 
Explanation: .<p>incidence rate is defin ed as the number of new case occurring in a defined population during a specified period of time.it will be seen from the above definition that incidence rate refers only to new cases,and during a given period usually assumed as one year.it also refers in a specified population or ";population at risk"unless other denominators are chosen.</p><p>ref:park&;s textbook of preventive and social medicine,22 nd edition,pg no 58</p>