This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pediatrics
[{'content': 'Late onset hemorrhagic disease of newborn is chaacterized 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 is common among breastfed babies. Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]