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 do indian meditation [title] Sit on the floor or in a chair. [step] Find a place where you can sit comfortably for at least ten minutes. It could be indoors or outside. <sep> (A) You could even wear the same socks or wear the same footrest. Although there are many practicing yoga, it is not truly necessary to practice it. (B) Don't meditate in a bad home, as, your home will be home to a chronic and pushy person, and it will likely get tired again. [substeps] If you can, find a warm place that will allow you to sit comfortably for at least 30 minutes, preferably in a room that is not hot or stuffy. (C) [substeps] You could also hold a prayer or light candle. If you can't find a comfortable place in your home, try reading a magazine or doing a search for guided meditation websites. (D) What matters most, however, is that it is quiet and free from distracting noise like music, television, or people talking. [substeps] Not all noise is bad in the vipassana tradition.

Ex Output:
D


Ex Input:
[header] How to buy a last minute cheap flight [title] Check airline newsletters, websites that specialize in last minute air travel and the travel section of your local newspaper to find last minute deals on flights. [step] Sometimes you can save money by booking flights late because airlines that have not filled their planes will offer discount fares. [title] Compare airfares from different airlines, websites and travel agencies. <sep> (A) [step] Look at every airline's website so that you can compare and contrast prices. [title] Opt for free flights as before, otherwise follow the full booking program and you'll not miss your flight in a long time. (B) [step] Try booking flights from big-ticket airlines such as kiwi airlines and delta. [title] Compare prices from travel agencies that are offering cheaper flights. (C) [step] Purchasing flights directly from the airline is not always the cheapest deal, so check out a few different travel websites and travel agencies to compare prices. [title] Search for flights during undesirable days and times. (D) [step] Compare each airline's prices with the prices you are interested in. You might be able to find a cheaper flight for free.

Ex Output:
C


Ex Input:
[header] How to get rid of migraines [title] Learn all you can about migraines. [step] Nobody knows exactly what causes migraines. A lot of research has gone into the exact cause of migraines, but with little success. <sep> (A) People who experience migraines regularly have been having regular consultations with doctors and they still don't know what is causing them. Anything you experience requires some much-needed research or hypnosis to rule out any medical issues or underlying conditions. (B) Migraines result from a lack of sensory focal points or groups. They occur in fewer than three brain groups. (C) Just finding out what causes them will give you some tips on dealing with them. [substeps] Most people develop migraines because they have no symptoms or aren't able to respond to stimuli. (D) It is generally agreed upon that the trigeminal nerve plays a role in migraine pain. The trigeminal nerve is a cranial nerve that facilitates a major pain pathway.

Ex Output:

D