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:
A man shows how to change a tube in a tire. he <sep> (A) puts a jack under the tube to lift it up. (B) puts a new tire on the tube. (C) takes the old tube out, puts the new one in, then pumps it up. (D) moves dirt covering the tube.

Ex Output:
C


Ex 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.

Ex Output:
D


Ex Input:
[header] How to get involved with the american red cross [title] Donate financially to the american red cross through the internet, or via phone, text or mail. [step] You can also give stocks and mutual funds to the red cross, or leave the organization money in your will. [substeps] The american red cross also benefits when you purchase medical supplies and t-shirts through its website. <sep> (A) [title] Get to know local businesses and business. [step] Graduate from a bachelor's degree at a lower level to become a member of a national red cross association. (B) [title] Be a supporter of the red cross. [step] Many red cross organizations have representatives on staff for delivering information and offering support and services. (C) In addition, the organization hosts special fundraising drives when a special circumstance arises or a disaster strikes. [title] Contact your local chapter of the red cross to find out about volunteer opportunities in your hometown. (D) [title] Find a family member, friend or representative who is passionate about the american red cross and would be willing to help you do some hard work and kind market. [title] Join a charity organization for women in your country, church, or organization.

Ex Output:

C