This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Embryology, Subject name: Anatomy
[{'content': 'Tonsil is derived from: \nSelect and explain. \nA. 1st pouch, B. 2nd pouch, C. 3rd pouch, D. 4th pouch', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. 2nd pouchPharyngeal PouchDerivatives1Tympanic (middle ear) cavity Auditory (eustachian) tube2Palatine tonsils Tonsillar fossa3Inferior parathyroid gland Thymus4Superior parathyroid gland uitimobranchial body (parafollicular cells of the thyroid gland)', 'role': 'assistant'}]