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: Biochemistry
[{'content': 'Lipid soluble plasma membrane associated antioxidant? \nSelect and explain. \nA. Ubiquitin, B. Vitamin E, C. Vitamin C, D. Glutathione', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Vitamin E"Alpha-tocopherol is the only lipid soluble, chainbreaking antioxidant present in biological membranes".', 'role': 'assistant'}]