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: Medicine
[{'content': 'The following are components of Brown sequard syndrome except - \nSelect and explain. \nA. Ipsilateral extensor plantar response, B. Ipsilateral pyramidal tract involvement, C. Contralateral spinothalamic tract involvement, D. Contralateral posterior column involvement', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]