<prompt> Which nerve is in close relation with root of the lower third molar :Inferior alvolar nerveChorda tympani nerveLingual nerveMyolohyoid nerve  <response>: C i.e. Lingual nerveLingual nerve br. of mandibular nerve comes in contact with the mandible, where the thin lingual plate forms a shallow groove below and medial to the last 3rd molar toothQ, just above the posterior end of the mylohyoid line. 