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: Unknown
[{'content': 'The feature of hemorrhagic disease of the new born is - \nSelect and explain. \nA. Prolonged prothrombin time, B. Defective platelet count, C. Decreased bleeding time, D. Prolonged thrombin time', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' Prolonged prothrombin time Hemorrhagic disease of the newborn. It is caused by a deficiency of vitamin K dependent factors (II, VII, IX, X)*. Bleeding occurs in 0.25-1.7% of newborns who do not receive vitamin K prophylaxis after birth. Symptoms - Sites of ecchymoses and surface bleeding include - Gastrointestinal tract Umbilical cord Circumcision site Nose Sometimes intracranial hemorrhage can occur. Laboratory features of hemorrhagic disease of new bom : Platelet count -Normal Prothrombin time -Prolonged* Thrombin time -Normal until very late in the disease* Fibrinogen -Normal Factor V -Normal", 'role': 'assistant'}]