This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Parafollicular cells (C-cells) in the thyroid are derived from \nSelect and explain. \nA. Neural crest, B. Ultimobranchial body, C. Median bud of pharynx, D. Pharyngeal pouch', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cells of the ultimobranchial body give rise to the parafollicular, or C cells of the thyroid gland. These cells secrete calcitonin, a hormone involved in regulation of the calcium level in the bloodRef: Langman&;s Medical embryology; 12th edition; Chapter 17; Head and Neck', 'role': 'assistant'}]