This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
[{'content': 'Prologed PT and Normal PTT may be seen in - \nSelect and explain. \nA. Thrombocytopenia, B. DIC, C. Vit. K deficiency, D. None', 'role': 'user'}, {'content': 'Answer: D \nExplanation: PT measures extrinsic system and common pathway APTT measures intrinsic and common pathway In thrombocytopenia , coagulation pathway is not affected. So no change in PT , APTT In DIC and vit k deficiency both PT and APTT are prolonged Reference : Harsh Mohan textbook of pathology, 7th edition.Pg no.314,317', 'role': 'assistant'}]