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: Biochemistry
[{'content': 'C peptide is pa of: \nSelect and explain. \nA. Pro-insulin, B. Insulin, C. ACTH, D. Growth hormone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: C-peptide is a peptide that is made when proinsulin is split into insulin and C-peptide.', 'role': 'assistant'}]