This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'The four "Pyrole rings" in hemoglobin molecule are joined together by \nSelect and explain. \nA. Disulphide bridges, B. Methylene bridges, C. Hydrogen bonds, D. Alpha bonds', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]