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
Prologed PT and Normal PTT may be seen in - 
Select and explain. 
A. Thrombocytopenia, B. DIC, C. Vit. K deficiency, D. None
D: None
Answer: D: None 
Explanation: 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