This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
The crystalline lens derives its nourishment from - 
Select and explain. 
A. Blood vessels, B. Connective tissue, C. Aqueous and vitreous, D. Zonules
C: Aqueous and vitreous
Answer: C: Aqueous and vitreous 
Explanation: The crystalline lens, being avascular structure is dependent for its metabolism on chemical exchanges with the aqueous humour. Some nutrition is also derived from the vitreous humour, but it is much less than that derived from aqueous humour.