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: Gynaecology & Obstetrics
[{'content': 'How is iodide transported across the placenta \nSelect and explain. \nA. Simple diffusion, B. Carrier - mediated process, C. Endocytosis, D. No transport', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Iodide is transported by a carrier mediated process and is energy - requiring active process. Placenta indeed concentrates iodide.', 'role': 'assistant'}]