Which of the following is the major refracting body of the eye giving it the power of accommodation?

The crystalline lens is the primary refracting body of the eye responsible for accommodation. Accommodation is the process by which the eye adjusts its focus to see objects clearly at various distances. The crystalline lens can change shape, becoming thicker or thinner in response to the actions of the ciliary muscles. This flexibility allows the eye to increase its optical power to focus on nearby objects and decrease it for distant objects.

While the conjunctiva is a thin membrane covering the front of the eye and the lens cortex and lens nucleus are parts of the lens structure, they do not actively participate in the accommodation process. The cortex is the outer layer of the lens, and the nucleus is the center. However, it is the overall structure and function of the crystalline lens that enables accommodation, making it the correct choice in this context.