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". 

Input: Consider Input: The doctor uses a brush to scrub nails and hands. A doctor washes their hands in a large stainless steel sink with hand soap multiple times. the doctor <sep> (A) uses the brush to rub a suture needle into his palms. (B) uses a towel to clean on the sink. (C) uses a small brush to wipe several areas on the body of the sink and change water for the other areas. (D) completely rinses their hands then clasps together and walks out of the room without touching anything.

Output: D


Input: Consider Input: [header] How to install custom firmware [title] Record the router's model and version number. [step] These numbers are usually located near the manufacturer's logo, underneath or in back of the router. Write down the model and version information for future use. <sep> (A) [substeps] If you are using windows xp (default operating system), the model number can be found in the start menu under " system settings. " skip all the discussion menus, and then go to system preferences. (B) [title] Obtain the router's ip address and default gateway for your computer system. [substeps] Determine the ip address and default gateway for a pc. (C) [substeps] " w " with the green background is the serial number for the model. " p " with the red background means " unhappy operating system. (D) [substeps] It is easy to determine what operating system is running on your router if you don't know the model. Copy the model from the registry to convert it to your operating system.

Output: B


Input: Consider Input: [header] How to do homework quickly and effectively [title] Make sure you have a good environment to do your homework in. [step] The more focused you are, the more work you will manage to get done, so get a good place to do the task to maximise productivity. [title] Try to find somewhere that is relatively quiet. <sep> (A) [step] Where students cannot be bothered watching tv or talking on headphones will also help you get up to speed and get it done. [title] Take a break for a few minutes at least. (B) [step] Listening to the radio, texting a friend, ringing the doorbell, etc. Are good places to spend your time, because you won't be interrupted if your attention is diverted. (C) [step] This should ideally be away from the centre of your house or wherever you are setting up. A bit of silence can really help you to get in the zone. (D) [step] This is particularly important if you are studying in a quiet environment, such as the locker room or cafeteria. It needs to be quiet enough for both you and your classmates to concentrate, and it needs to be quiet enough for you to earn the points you need to improve on.


Output: C