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': 'Which neck swelling moves on swallowing \nSelect and explain. \nA. Submandibular salivary gland, B. Thyroid gland, C. Supraclavicular lymph gland, D. Sternomastoid tumour', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Thyroid gland", 'role': 'assistant'}]