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 stay up late without electronics [title] Drink caffeine. [step] Caffeine blocks neurotransmitters in your brain that make you sleepy. When you start to feel drowsy, reach for a cup of coffee or a soda. <sep> (A) Remember that caffeine loses its effectiveness with overuse. Try to save it for when you really need it. (B) Your body will start shutting down caffeine when you're outside and keep you awake by doing what it is meant to do. It can help you stay awake long enough to go to bed. (C) Though caffeine will not give you energy right before sleep, it will trigger the natural sleep signal that draws us into the world right before it hits. An caffeine-rich beverage will wake you up more, making your sleep better. (D) Coffee is the source of human sleepiness so drinking coffee or another caffeinated beverage before bedtime is important. Even an extra pill is a key lubricant.

Ex Output:
A


Ex Input:
[header] How to teach your dog to speak [title] Choose your reward. [step] Pick something your dog really loves; the better the reward, the easier it will be to teach your dog. If your dog loves to play, you can try using her favorite toy and playing with her when she barks. <sep> (A) In some cases, you can train your dog to bark through verbal praise. [substeps] Figure out your dog's reward based on cultural context. (B) Point out what your dog likes to play with and put a look on the chart indicating what she wants to learn. [title] Tell your dog to " sit ". (C) Most people, however, will find that treats are the most effective way to teach a dog. The best treats will be ones your dog loves, and which are also easy to carry, easy to break into pieces, and healthy. (D) If her bark is off-putting, encourage her to try other tricks, to avoid barking. [substeps] If you provide a toy or two, this will be enough to train your dog to try the reward.

Ex Output:
C


Ex Input:
[header] How to clean suede gloves [title] Check your gloves' care tags. [step] Before you begin cleaning your suede gloves, check the care tags. There are a lot of different types of suede and suede finishes, and each type has different care needs. <sep> (A) Learn about each individual suede product and its care signs to ensure you make the right cleanser. [substeps] The care signs for gloves should be number 1 or the latest amount and level of use. (B) The tags should tell you the best process for cleaning your type of suede. [substeps] For example, you should not use water on very fine suede, since the water will likely stain it. (C) You should check these care tags to see if your item (or product) specifically needs to be cleaned or pressed before caring for it. [substeps] You can check your care tag by pulling out a cardboard box or hand-washing it in your washing machine. (D) Items like suede pots, pans, and bins will have different care shots you must follow. [substeps] Ask the retailer to make a call or to send you your basic cleaning kit.

Ex Output:

B