Name the four pairs of paranasal sinuses.

The four pairs of paranasal sinuses are indeed the frontal, maxillary, ethmoidal, and sphenoidal sinuses. These sinuses are air-filled spaces located within the bones of the skull and serve various important functions, including the reduction of skull weight, resonance for the voice, and the humidification and filtration of inhaled air.

The frontal sinuses are located above the eyes in the forehead region. The maxillary sinuses are situated within the maxilla, or cheekbone area, and are the largest of the paranasal sinuses. The ethmoidal sinuses are a collection of small air cells located between the nose and the eyes, while the sphenoidal sinuses are found within the sphenoid bone, deeper in the skull just behind the nasal cavity. Collectively, these sinuses communicate with the nasal cavity and play a crucial role in sinus drainage and overall respiratory function.

The other options listed do not consist of recognized paranasal sinuses. For example, the nasal and cranial sinuses are not specific anatomical structures. Likewise, the mandibular, lacrimal, and other listed sinuses do not exist as paranasal structures. This makes Option A the only correct identification of the actual