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': 'Which gland is enclosed by pretracheal fascia? \nSelect and explain. \nA. Parotid gland, B. Thyroid gland, C. Submandibular gland, D. Sublingual gland', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]