<prompt> C-cells of thyroid are derived fromI branchial archII branchial archIII branchial archUltimobranchial body  <response>: D. i.e. Ultimobronchial body - Most of thyroid gland develop from thyroglossal duct an endodermal bud at foramen caecumQ- Parafollicular or C-Cells which produce calcitonin are derived from - ultimobranchial bodyQUltimobronchial body is derived from 5th pharyngeal pouch. 