<prompt> Paranasal sinus present at bih among the following?Frontal and maxillaryEthmoid and maxillaryFrontal and ethmoidSphenoid and ethmoid  <response>: Maxillary sinus - Develop at bih; completely develop at 9 yearsEthmoidal sinus - Development at bih; completely develop at late pubeyFrontal sinus - Develop at 2 years; completely develop at late adolescenceSphenoid sinus - Develop at 3-5 years; completely develop at 12-15 yearsRef: PL Dhingra, Diseases of Ear, Nose Throat, 7th edition, pg no. 211 