<prompt> Posterior communicating aery is a branch of:Internal carotidExternal carotidMiddle cerebralPosterior superior cerebellar  <response>: Posterior communicating aery is a branch of the cerebral pa of the internal carotid aery. The cerebral pa lies at the base of the brain.Ref: Human Anatomy, B D Chaurasia, 4th Edition, Volume 3, Chapter 6, Page 103. 