You will be given a definition of a task first, then some input of the task.
In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".

[header] How to cure keratoconus naturally [title] Manage your allergies, if you have any. [step] If your eyes are itchy due to allergies, take an antihistamine regularly and avoid allergens. Additionally, you should try to manage any allergies you have, even if they don't directly affect your eyes. <sep> (A) [substeps] Have a collection of questions handy, such as the following to figure out if you have a cause for your sensitivity. Are you allergic to your eyes? If you have seasonal allergies, bad eye conditions may cause the irritation. (B) [substeps] Sleeping pills can also help your eyes, but if that's not an option for you, use pill vapor patches instead. [title] Talk to your doctor about phenylalanine. (C) [title] Soak your lenses to reduce your blink. [step] Soaking the lenses in a gritty solution of water and soap will help to lower your irritability. (D) Skin and food allergies might also cause eye inflammation and could be related to keratoconus. [title] Drink more milk and take a calcium supplement.
Output:
D