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': 'All of the following molecules, without fuher metabolism, can cross the inner membrane of functioning mitochondria, EXCEPT: \nSelect and explain. \nA. ATP, B. Acetyl CoA, C. Inorganic phosphate, D. Pyruvate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The size and the charge on CoA derivatives prevents their transpo. Thus the cell has two pools of CoA derivatives, cytoplasmic and mitochondrial.', 'role': 'assistant'}]