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': 'Fast fatigue fibres are recruited during walking: \nSelect and explain. \nA. In the beginning, B. In the end, C. Throughout the walking process, D. When small neurons are excited', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. In the end', 'role': 'assistant'}]