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 the following muscle fibre is brown in color? \nSelect and explain. \nA. Type I, B. Type II A, C. Type II B, D. Type III', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Muscles are frequently classified into two types, “slow” and “fast.” These muscles can contain a mixture of three fiber types: type I (or SO for slow-oxidative); type IIA (FOG for fast-oxidative-glycolytic); or type IIB (FG for fast glycolytic).\nMuscle Fiber Types', 'role': 'assistant'}]