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': 'Anterior cerebral artery occlusion can cause - \nSelect and explain. \nA. Urinary retention, B. Contralateral lower leg weakness, C. Hemianaeshsia of opposite side of face, D. Hemianopia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]