<prompt> Parafollicular cells C-cells in the thyroid are derived fromNeural crestUltimobranchial bodyMedian bud of pharynxPharyngeal pouch  <response>: 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 