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
Tonsil is derived from: 
Select and explain. 
A. 1st pouch, B. 2nd pouch, C. 3rd pouch, D. 4th pouch
B: 2nd pouch
Answer: B: 2nd pouch 
Explanation: 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)