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: Dental
[{'content': 'Mercury is toxic because it \nSelect and explain. \nA. Complexes with hemoglobin to form methemoglobin, B. Inhibits hemoglobin synthesis, producing anemia, C. Inhibits anaerobic glycolysis, D. Binds to sulfhydryl groups', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]