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 change trackpad settings on macbook pro [title] Find the system preferences. [step] Starting from your main desktop screen there are two ways to find the system preferences where the mouse and touchpad settings will be located : [title] Bring your cursor to the bottom screen and find the system preferences application. [step] The icon looks like a box with three gears inside it. <sep> (A) Open that to find all your system preferences. [substeps] Alternatively, you can use the spotlight feature. (B) On macbook pro this icon resembles a round blue square with a horizontal green dot on it. On other applications this icon is actually a box with a gear, and is small in appearance. (C) It can be located on the taskbar or in the upper left-hand corner of the window. [title] Let the system preferences application perform its work. (D) [title] Click the customize key in the dialog box. [title] Follow the on-screen instructions to change the customization function.

Ex Output:
A


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 be a pacifist [title] Being a pacifist is not about the label. [step] If you want to be a pacifist, it's good to start with identifying your reasons why. Try not to jump into it for status or being able to tell all your friends that you've become a non-violent person. <sep> (A) There are a few good reasons to being a pacifist. Some things you might consider are : [substeps] Becoming a pacifist establishing your own identity self-respect self awareness emotional desires a sense of pride [title] Think about your type of lifestyle. (B) [title] Distinguish between hardcore and emo punk. [step] Bands that are displayed in commercially-produced clothing stores are hardcore punk. (C) [substeps] Check to see if your parents approve of your use of pacifiers. Have you ever seen any of your parents protest the idea of you taking your pacifier? Ask your parents if they would change their minds if you changed your mind. (D) [title] Starting with simple changes, like not hoovering up bugs on the carpet but letting them out, are small yet effective ways of including pacifism into your life. [title] Try to read up on the jainist, buddhist or hindu principles of ahimsa.

Ex Output:

D