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
C-cells of thyroid are derived from 
Select and explain. 
A. I branchial arch, B. II branchial arch, C. III branchial arch, D. Ultimobranchial body
D: Ultimobranchial body
Answer: D: Ultimobranchial body 
Explanation: D. i.e. Ultimobronchial body - Most of thyroid gland develop from thyroglossal duct (an endodermal bud at foramen caecum)Q- Parafollicular or C-Cells which produce calcitonin are derived from - ultimobranchial bodyQUltimobronchial body is derived from 5th pharyngeal pouch.