<prompt> All the following veins drain into internal jugular vein exceptFacial veinLingual veinRetromandibular veinSuperior thyroid vein  <response>: Retromandibular veinInternal Jugular veinIt is the continuation of sigmoid sinusTributaries of IJV1. Inferior Petrosal sinus2. Ferial3. Lingual4. Pharyngeal5. Superior thyroid vein6. Middle thyroid vein 