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': 'Factor associated with increased incidence for sudden infant death syndrome is – \nSelect and explain. \nA. High socioeconomic status, B. Female gender, C. Supine sleep positioning, D. Maternal smoking', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]