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
Positive predictive value depends on all except ? 
Select and explain. 
A. Sensitivity, B. Specificity, C. Prevalence, D. Incidence
D: Incidence
Answer: D: Incidence 
Explanation: Ans. is 'd' i.e., Incidence Positive predictive value (PPV) of a screening test depends on : - Sensitivity Specificity Prevalence of disease As the sensitivity and specificity of a test are relatively constant, positive predictive value is mainly dependent on the prevelance of disease.