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': 'Which of the following subtance is toxic to neurons? \nSelect and explain. \nA. Unconjugated bilirubin, B. Bile salt, C. Haemoglobin, D. Melanin', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Unconjugated bilirubin", 'role': 'assistant'}]