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': 'For a neonate at 48 hours of bih with a history of non-passage of meconium, next step in evaluation will be: \nSelect and explain. \nA. Sweat chloride level, B. CFTR mutation analysis, C. Lower GI study, D. Manometry', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. c. Lower GI study', 'role': 'assistant'}]