This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: New born infants, Subject name: Pediatrics
[{'content': 'Fetal Lung Maturity assessed by all except \nSelect and explain. \nA. Measurement of alpha feto protein, B. Lecithin:sphingomyelin ratio, C. Measurements of amnotic fluid creatinine, D. Phosphatidyl choline concentration in amniotic fluid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]