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". 

Input: Consider Input: [header] How to become an endocrinologist [title] Obtain a bachelor's degree in a science-related major. [step] Though you could choose any major you want, it's best to study something like physiology, biology, or social science. These majors will help you build the prerequisite skills for medical school. <sep> (A) [substeps] If you are enjoying high school, they might teach you basic tests or techniques, like how to fight ethylene gas. Foreign nationals don't get their master's degree until they finish medical school. (B) [substeps] These degree levels will take some effort on your part, so keep an eye out for whatever college you want to attend. It's not always necessary to go to medical school if you're currently planning on med school. (C) [substeps] Enroll in or look for a program at an accredited medical school. Most states require endocrinology courses at high schools and universities. (D) In addition to studying science, you should also take courses in math, english, and the humanities. These courses can help prepare you for interacting with patients and writing reports.

Output: D


Input: Consider Input: [header] How to change a drill bit [title] Loosen the chuck. [step] The chuck is piece on the end of the drill that loosens and tightens to hold the bit. Grasp the chuck with one hand while you hold the handle of the drill with your other hand. <sep> (A) Loosen the chuck by sliding the drill bit along one side. If you have known it already, it will already be loose, but there is a screw on the end of the piece that holds the bit in place. (B) Use extra leverage as you slowly press down on the chuck to loosen it. [substeps] Keep your eye on the chuck while you are tightening it. (C) Twist the chuck counterclockwise to loosen it. Another option is to pull the trigger gently while holding the chuck. (D) Begin to tighten the chuck by turning it clockwise so that the chuck remains firmly in place. Use your wooden allen or long-handled allen key to turn the chuck clockwise until it is firmly within the drill's circle.

Output: C


Input: Consider Input: [header] How to care for sweaters [title] Fold your sweaters. [step] Don't ever hang them because hanging sweaters will result in a larger sweater than the last time you put it on, or a misshapen profile. [title] Remove pills from your sweaters regularly to keep them looking presentable. <sep> (A) [step] A small piece of paper from a package containing a piece of letterhead will be sufficient for this purpose. [title] Make sure to download from a reliable website. (B) [step] Pilling is caused by rubbing during wear and is more apparent around the elbows, under the armpits and on sleeves but can occur anywhere on the sweater. Purchase a hand-held depiller or a small electric shaver made for depilling. (C) [step] Do not keep a leftover pill from a pharmacy or at home because you may throw the disc out the window when you throw the next one. [substeps] Be sure you throw away any empty bottles or other containers of pills that break during the trip. (D) [step] Your calendar gives you a good idea how often and what to avoid, so it's important to keep track of what times you're spending on your sweaters each day. Try to take your medication away every 3-5 days.


Output: B