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:
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.

Ex Output:
D


Ex Input:
[header] How to solo travel to vienna [title] Plan to stay in a hostel. [step] When traveling alone, it's always a good idea to stay at a hostel. Not only are hostels generally cheaper than hotels, this will help you meet people during your travels. <sep> (A) Taking advantage of free accommodations can help you pass the time and save money. [title] Plan initial backpackers getting used to the cities and customs of vienna on the flat travelling budget. (B) While there are many events you may enjoy alone, vienna has a booming nightlife. On occasion, you may want company for a night out, so a hostel is a good option for this. (C) It will also offer a safe, modern way to escape from the nightlife. An hostel is also a good place to set your budget on a day-to-day basis as you decide if you want to stay alone. (D) Search online for hostels near you if you want to take a trip somewhere you've never been, and plan to stick to the hostel's offerings. [substeps] The best traveling companions who are available in these places will be people who seem friendly, adventurous, and easily reunited from their long life.

Ex Output:
B


Ex Input:
[header] How to fix a white screen on an ipod [title] Let your device turn itself off. [step] This means you shouldn't be seeing the apple logo on the screen, rather it should just be black. If you must, wait until the screen turns off. <sep> (A) [title] Power on your ipod when asked, " should i turn it off? [step] " you can pull out the power button, or leave it unlocked. [title] Swipe the screen to the left or right if it's hanging. (B) This will prevent you from using the menu or trying to push the settings switch. To do this : [substeps] Turn off the ringer. (C) This is usually 6:00am to earlier pm, not 6:00pm to 9:30 pm, and you want to take it to ensure it has been turned off. It won't shut itself off until then. (D) [substeps] If your device won't turn off, let the battery run dead. This may take a few hours, but if your phone is no longer responding to button use and won't turn off, it is the best option.

Ex Output:

D