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
Factor associated with increased incidence for sudden infant death syndrome is- 
Select and explain. 
A. High socioeconomic status, B. Female gender, C. Supine sleep positioning, D. Maternal smoking
D: Maternal smoking
Answer: D: Maternal smoking 
Explanation: Ans. is 'd' i.e., Maternal smoking