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': 'Intercostobrachial nerve is a branch of - \nSelect and explain. \nA. 1st intercostal nerve, B. 2nd intercostal nerve, C. 3rd intercostal nerve, D. Upper trunk of brachial plexus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Intercostobrachial nerve\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Lateral cutaneous branch of 2nd intercostal nerve\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Supplies\n\nSkin of floor of axilla.\nUpper part of medial aspect of arm.', 'role': 'assistant'}]