C-cells of thyroid are derived from: (A) I branchial arch, (B) II branchial arch, (C) III branchial arch, (D) Ultimobranchial body
Answer is D. 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.