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: 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: Ans. is 'None' o Option a and d are defects of platelets --) Bleeding time is prolonged, PT and PTT are normal. o DIC (causes deficiency of all factors) and vitamin k deficiency (causes deficiency of factor II, VII, IX, X) cause prolongation of both PT and PTT.