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: Medicine
[{'content': "Hepatic secretory function is evaluated using \nSelect and explain. \nA. Alkaline phosphatase, B. 5' nucleotidase, C. Gamma glutamyl transpeptidase, D. Prothrombin time (PT)", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer- D. Prothrombin time (PT)The most widely used tests are those measuring the blood concentration of aspaate aminotransferase (AST) and alanine aminotransferase (ALT).Congulation proteins: The easiest way to estimate the concentration of the coagulation factors is by measuring the prothrombin time (PT), which is normally l0 to 13 seconds. Prolonged PT is a sensitive index of liver function loss.', 'role': 'assistant'}]