This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Lens), Subject name: Ophthalmology
Lens contains which antigen? 
Select and explain. 
A. Sequestered antigens, B. Cross antigens, C. Heterophile antigens, D. Isoantigens
A: Sequestered antigens
Answer: A: Sequestered antigens 
Explanation: ANSWER: (A) Sequestered antigensREF: Immunotoxicology and risk assessment By Dennis K. Flaherty p-182"Lens contains sequestered antigens"