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': 'What are the buidling blocks for mostly lipids? \nSelect and explain. \nA. Carbohydrates, B. Proteins, C. Fatty acid, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The building blocks of most lipids are fatty acid.', 'role': 'assistant'}]