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: A marching band is in the midle o street. behind the marching band <sep> (A) people are in s street playing. (B) the drummers are covering the ground. (C) , a tire is taken off and replaced with a new tire. (D) a fire truck is in the parade.
Example Output: D

Example Input: [header] How to fall asleep if you are blind or visually impaired [title] Talk to your doctor. [step] If you are a blind or visually impaired person who is having trouble falling asleep, you should set up an appointment with your doctor. Ask your doctor to examine you for non-24, a sleep disorder that frequently affects visually impaired and blind people. <sep> (A) This can help you make a diagnosis and develop strategies to speed up your recovery. [substeps] Ask your doctor if sleep loss, depression, dyslexia, or dyslexia problems might be the issue and advice you need. (B) A doctor can make a diagnosis of a sleep disorder and understand your problem. Treatment of the sleep disorder based on the condition will help your doctor identify the underlying cause and decide how long it is necessary to treat you. (C) Your doctor may refer you to an optometrist or psychologist who has experience treating dementia or cognitive dysfunction. Your doctor may want to examine you in several places or diagnose various medical conditions. (D) [substeps] Non-24 is a disorder that affects your sleep-wake cycles and is common in blind people. People with non-24 have trouble falling and staying asleep at night, as well as extreme urges to nap during the day.
Example Output: D

Example Input: [header] How to get zynga chips [title] Launch the zynga poker app from your preferred platform. [step] Currently there are three versions of the app including the, the, and the zynga poker yahoo! App. [title] Check available chips. <sep> (A) [step] Your current chip totals are displayed on the upper left corner of the game screen, right beside a picture of a black poker chip. If you have enough chips, you don't need to buy more for now. (B) [step] If you'd rather make sure that your chips are safe to play, check " specialty chips " or " premium chips ". If you would rather play with high quality chips as opposed to regular chips like s200 chips, the zynga calculators feature online tools for determining the available chips. (C) [step] Tap the " buy now " button on your app's navigation bar to apply to any chip. You'll be redirected to a popup indicating how many chips are currently available in app stores. (D) [step] There are four free chips that are available: the zynga chips pro, ruleforwii, and shi pro. Tap on the nearest app to launch the app to view its options.
Example Output:
A