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: Physiology
[{'content': 'Which of these substances need proteins to transport across cell membrane \nSelect and explain. \nA. CO2, B. Steroid harmones, C. Vitamin E, D. Glucose', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Lipid soluble substances can easily cross membrane. Whereas water soluble substane like glucose needs transporter protein to cross cell memrane.', 'role': 'assistant'}]