<prompt> Griesingers sign is observed in which of the following condition?Abducent nerve paralysisOtosclerosisLateral sinus thrombosisPetrositis  <response>: Griesingers sign: Erythema and oedema posterior to the mastoid process resulting from septic thrombosis of the mastoid emissary vein. It is seen in lateral sinus thrombosis. 