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': "Fluoride is carried in the blood via: \nSelect and explain. \nA. Plasma, B. RBC'S, C. Both plasma & RBC, D. WBC'S", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]