ENT General 53ec7325 Which sinus is the last sinus to appear radiologically on X-ray? A Maxillary sinus B Sphenoid sinus C Frontal sinus D Ethmoidal air cells High-Yield Explanation Ans. is'c'i.e., Frontal sinus[Ref Textbook Of The Ear, Nose And Throat By De Soum, C. Et Al. p 394)