<prompt> Lower lip blood supply:Angular arteryLateral nasal arteryLabial arteryGreater palatine artery  <response>: Ans. B Labial nasal arteryRef: Grays Anatomy 41st ed. P 498 External carotid artery gives rise to facial artery branch, which has several branches over face. Superior labial-supplies to upper lip and antero-inferior part of nasal septum. Inferior labial-supplies to lower lip. Lateral nasal-to the ala and dorsum of nose. Angular-supplies the lacrimal sac and orbicularis oculi. 