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': 'Ductus arteriosus closes in response to – \nSelect and explain. \nA. Decrease in peripheral oxygen saturation, B. Indomethacin therapy, C. Prostaglandin E1, D. Increase in pulmonary vascular resistance', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]