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: Pediatrics
[{'content': 'Feature of hemorrhagic disease of new born is – \nSelect and explain. \nA. Prolonged prothrombin time, B. Defective platelet count, C. Prolonged bleeding time, D. Prolonged thrombin time', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Normal new borns are moderately deficient in vitamin K.\nThis deficiency increases on 3rd to 5th day when, vitamin K level falls further. The serum level of vitamin K starts increasing from 13th to 15th day of life and achieves adult level at 3 months.\nThis is normal, and does not produce any bleeding.\nIn hemorrhagic disease of the newborn there is delay in achieving the normal vitamin K level.\n\nClinical Features\n\nVitamin K deficiency produces severe bleeding.\nBleeding occurs from umbilical cord stump on 2nd/3rd day after birth.\nIntracranial bleding and large intramuscular hemorrhages may occur.\nIncreased prothronzbin time and increased partial thromboplastin time.\n\nT/T\n\nParenteral vitamin K therapy.', 'role': 'assistant'}]