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': 'Two major types of muscle fibres are found in humans \nSelect and explain. \nA. White and brown, B. White and yellow, C. White and gray, D. White and red', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]