Derivative of ultimobranchial body: (A) Thyroid, (B) Capsule of thyroid, (C) Parafollicular 'C' cells, (D) 2nd branchial pouch
Answer is C. PHARYNGEAL POUCH DEVELOPS INTO 1st Tympanic cavity and eustachian tube 2nd Tonsillar epithelium 3rd Ventrally: thymus Dorsally: inferior parathyroid 4th Superior parathyroid 5th Ultimobranchial body The ultimobranchial body will be found attached to pharyngeal pouch 4. It receives some neural crest cells which will form the parafollicular C cell of thyroid gland; which help in the production of hormone calcitonin.