______ is the fluid in the posterior chamber of the eye

Correct option is D

Aqueous humor is a clear, watery fluid found in both the anterior and posterior chambers of the eye. It is secreted by the ciliary body and flows from the posterior chamber to the anterior chamber, nourishing the cornea and lens and maintaining intraocular pressure. Blockage in its flow can lead to glaucoma.
Explanation of options: (a) ✘ Perilymph – A fluid found in the cochlea of the inner ear, not the eye. (b) ✘ Vitreous humor – Found in the vitreous chamber (posterior cavity), not the posterior chamber. (c) ✘ Endolymph – Present inside the membranous labyrinth of the inner ear. (d) ✔ Aqueous humor – Located in the posterior chamber, essential for eye pressure and nourishment.