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".

Ex Input:
[header] How to get rid of white tongue [title] Call your doctor or dentist if you have other symptoms that together might indicate a more serious condition. [step] Other symptoms to check for include : [substeps] Pain in your tongue dehydration fever a white tongue that doesn't go away after several weeks [title] Know the difference between white tongue and geographic tongue. [step] Generally neither condition is serious. <sep> (A) But for certain people, this is known as " tongue illness. " [title] Learn about the signs of tongue disease. (B) [title] Look for a white tongue tongue or tongue with a horizontal, smooth surface that blocks food from getting into the mouth. [step] This means that the tongue has a roof which it cannot move towards. (C) However, it does lead to significant pain. It is thought that the other condition if it occurs is called listerimucoccus nomisymmetrophy (tdd), a genetic condition that asks for unusually dark tongue. (D) [substeps] Geographic tongue occurs when you have smooth lesions that look like areas where the bumps on your tongue are worn away. Foods with strong tastes (spicy, acidic, salty) may cause you pain.

Ex Output:
D

Ex Input:
[header] How to use docusign on pc or mac [title] Open the docusign email. [step] Use this method if someone sent you an email containing a docusign document that must be signed. [title] Click review document. <sep> (A) [step] This will take you to the archived documents section. [title] Click the document you wish to delete. (B) [step] When the email is finally redirected to your email inbox, you'll see a checkmark beside the discussion item (e.g.: " news sources "). [title] Click the checkmark next to your reference item item at the top of the current page. (C) [step] Your document will have been reviewed by the ftc. Ask for experience diagnosing ftml errors. (D) [step] It's the yellow button in the email. [substeps] If the sender requires you to verify your identity, follow the prompts to do so.

Ex Output:
D

Ex Input:
A man is seen sitting on a piece of exercise equipment and rowing himself back and fourth on a machine. the man <sep> (A) moves in several more jumps while maintaining his momentum. (B) picks up a red elliptical and prepares it for use. (C) continues rowing forward and backward and faster while flipping his body and staying upright. (D) continues moving himself back and fourth as the camera captures him from several angles.

Ex Output:
D