This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Motor System, Subject name: Physiology
[{'content': 'A 17-year-old boy sustains serious head and neck trauma during a football game. Physical examination shows a positive Babinski sign. What pa of the brain has most likely been damaged in this boy? \nSelect and explain. \nA. Anterior motor neurons, B. Cerebellum, C. Coicospinal tract, D. Premotor coex', 'role': 'user'}, {'content': 'Answer: C \nExplanation: A positive Babinski sign in adults can indicate damage to the coicospinal tract. Positive Babinski sign occurs normally in children up to 2 years of age. The reflex occurs after the sole of the foot has been stroked with a blunt instrument; the big toe moves upward and the other toes fan out.', 'role': 'assistant'}]