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: Pharmacology
[{'content': 'Prothombin Time (PT) of a patient is 26, Control PT is 13 seconds and Sensitivity index is 1.41. What will be the INR of this patient? \nSelect and explain. \nA. 26/13, B. (26/13) x 1.41, C. (26/13)+1.41, D. (26/13)1.41', 'role': 'user'}, {'content': "Answer: D \nExplanation: The INR calculation has become a standard method for monitoring the PT values. It is calculated as = (patient prothrombin time/mean prothrombin time)ISI. Patient prothrombin time = 26 Mean prothrombin time = 13 ISI (International Sensitivity Index) = 1.41 INR = (26/13)1.41 Ref: Laboratory Hematology Practice By Kandice Kottke-Marchant, Bruce Davis, Page 424; Goodman and Gilman's The Pharmacological Basis of Therapeutics, 11th Edition, Page 1479; Physician Assistant's Clinical Companion By Springhouse, Pages 89-91", 'role': 'assistant'}]