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': 'A new born presented with Jaundice. Most common diagnostic Investigation of choice is \nSelect and explain. \nA. Total and Direct Bilirubin, B. Conjugated Bilirubin, C. Serum Bilirubin, D. Uroporphyrin levels', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bilirubin test : If it&;s thought your baby has jaundice, the level of bilirubin in their blood will need to be tested. This can be done using: a blood test of a sample of blood taken by pricking your baby&;s heel with a needle (the level of bilirubin in the liquid pa of the blood called the serum is then measured). Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]