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: Anatomy
[{'content': 'The kinetic energy of the body is least in one of the following phases of the walking cycle - \nSelect and explain. \nA. Heel strike, B. Mid-stance, C. Double support, D. Toe-off', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]