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".

Example Input: [header] How to know if you have glaucoma [title] Schedule regular eye exams. [step] Open-angle glaucoma leads to the gradual deterioration of your vision over an extended period of time, usually years. Most people suffering from open-angle fail to notice symptoms until the glaucoma is very advanced and nerve damage has occurred. <sep> (A) [substeps] Glaucoma is usually attributed to a condition called retinopausal glaucoma. Doctors often refer patients with retinopausal glaucoma to psychotherapy or therapy. (B) The overall diagnosis is: glaucoma can present in two patterns: primary and secondary. Secondary glaucoma reverses almost any natural condition and the simplest way to identify glaucoma is to get three to four eye exams in a normal week. (C) [substeps] It is important to schedule eye exams every year, especially if you are over the age of 40 or have a family history or glaucoma. Open-angle is the most common type of glaucoma in the united states, affecting over 2 million people. (D) Checking your eye closely is often the first step to identifying the signs of open-angle glaucoma. [substeps] Schedule a yearly eye exam using a variety of tools.
Example Output: C

Example Input: A man holds a pair of boots while talking and showing dirty parts. then <sep> (A) , he ankle many large tiny cuts of wood on the floor. (B) , the man replaces some parts by cutting the shoes and cleanser. (C) , the man puts paste on the boots, then he puts the shoes on. (D) , the man put a clothe inside the boot and brush the shaft of the boot thoroughly.
Example Output: D

Example Input: [header] How to pack for a seven day vacation [title] Check weather patterns in your destination city. [step] If you're not leaving for a few weeks or even months, find a list of average highs and lows for the time of year that you're going to a particular place. [substeps] Search for averages on wikipedia; the site lists average temperatures in the " climate " section on most pages for countries, states, and provinces. <sep> (A) Look for weather trends in your city or state. For example, if you're going in the warmer months, look for places that offer interesting weather according to season. (B) Figure out if you'll be travelling more than 1 day, or several, each time. Ask your hosts or friends if they have any tips about week-to-week weather events. (C) You might also google the weather in a given city. For example, you can search " average temperature in chicago in april " to get results that will be helpful for choosing what to pack. (D) Most cities have averages posted on your bus and train station schedule, too. Check your local weather forecast before you leave for a week or two before the trip.
Example Output:
C