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
ECG was performed on a total of 700 subjects with complaints of acute chest pain. Of these, 520 patients had myocardial infarction. Calculate the positive predictive value of ECG is:\r\n\r\n \r\n\r\n\r\n\r\nMYOCARDIAL INFARCTION\r\n\r\n \r\n \r\n \r\n\r\n\r\n\r\nECG\r\n\r\n\r\nPRESENT\r\n\r\n\r\nABSENT\r\n\r\n\r\nTOTAL\r\n\r\n\r\n\r\n\r\nPOSITIVE\r\n\r\n\r\n416\r\n\r\n\r\n9\r\n\r\n\r\n425\r\n\r\n\r\n\r\n\r\nNEGATIVE\r\n\r\n\r\n104\r\n\r\n\r\n171\r\n\r\n\r\n275\r\n\r\n\r\n\r\n\r\nTOTAL\r\n\r\n\r\n520\r\n\r\n\r\n180\r\n\r\n\r\n700\r\n\r\n\r\n\r\n\r\n\r\n 
Select and explain. 
A. 40%, B. 55%, C. 95%, D. 98%
D: 98%
Answer: D: 98% 
Explanation: Positive predictive value=true positive/(true positive+ false positive) 416/425 x 100= 98% Ref: Medical biostatistics, 1st edition pg: 201