This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: ENT
[{'content': 'Eustachian tube develops from: \nSelect and explain. \nA. 2nd and 3rd pharyngeal pouch, B. 1st pharyngeal pouch, C. 2nd pharyngeal pouch, D. 3rd pharyngeal pouch', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pharyngeal Pouch Derivatives 1 Tympanic (middle car) cavity, auditory (eustachian) tube 2 Palatine tonsils, tonsillar fossa 3 Inferior parathyroid gland, thymus 4 Superior parathyroid gland, ultimobranchial body (parafollicular C cells of thyroid)', 'role': 'assistant'}]