This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Oldest cells of Lens are in 
Select and explain. 
A. Nucleo - cortical junction, B. Nucleus, C. Anterior surface of lens, D. Posterior surface of lens
B: Nucleus
Answer: B: Nucleus 
Explanation: Lens contains oldest cells in its Nucleus.