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': 'Late onset hemorrhagic disease of newborn is characterized by all of the following features, EXCEPT: \nSelect and explain. \nA. Usually occurs in cow-milk fed babies, B. Onset occurs at 4-12 week of age, C. Intracranial hemorrhage can occur, D. Intramuscular vitamin K prophylaxis at bih has a protective role', 'role': 'user'}, {'content': "Answer: A \nExplanation: Late onset hemorrhagic disease of newborn occur in infants at 2 to 12 weeks who are exclusively breast fed, because breast milk contains very low levels of vitamin K. Ref: William's Obstetrics, 23rd Edition, Chapter 29; Nelson's Essentials of Pediatrics, 17th Edition, Pages 606, 607.", 'role': 'assistant'}]