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: Gynaecology & Obstetrics
[{'content': 'Vaginal bleeding in a neonate is commonly due to: \nSelect and explain. \nA. Sarcoma boytroides, B. Trauma of delivery, C. Hormonal withdrawal, D. Viral infection', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hormonal withdrawal', 'role': 'assistant'}]