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: Unknown
[{'content': "The lesion of Klumpke's paralysis is in - \nSelect and explain. \nA. Cervical plexus, B. Lower brachial, C. Upper brachial, D. Sacral plexus", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans - B', 'role': 'assistant'}]