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: Surgery
[{'content': "All are seen in Thoracic outlet syndrome except - \nSelect and explain. \nA. Mass in the Neck, B. Wasting of forearm muscles, C. Adson's test positive, D. Pallor", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Muscles of hand are wasted, not the forearm muscles.\n• Ulnar nerve (C8-T1) involvement is most common.\n• It is associated with:\n−− Motor weakness and atrophy of the hypothenar and interosseous muscles\n−− Pain and paresthesia along the medial aspect of the arm, hand, 5th finger and medial aspect of 4th finger.', 'role': 'assistant'}]