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 have healthy kidneys [title] Stay hydrated. [step] Staying properly hydrated is one of the best ways to keep your kidneys healthy. Without adequate water, your kidneys can lose some of their ability to filter your blood, and may even become damaged over the course of your lifetime. <sep> (A) [substeps] Drinking water helps your kidneys flush sodium, urea, toxins, and waste out of your body. By staying properly hydrated, you can significantly reduce your risk of developing chronic kidney disease. (B) Aim to drink at least 8 fluid ounces of water every day. This will help reduce any additional fluid or waste in your system and will also allow you to more easily relieve the symptoms of kidney problems. (C) Insufficient water will contribute to poor kidney function, such as kidney failure and rheumatoid arthritis. Trying to drink water with no filter might cause further kidney damage. (D) [substeps] The best amount of water recommended by experts is 1 gallon a day (2.5 liters) each. Drink bottled water, but you don't need soda, fruit juices, or other non-carbonated beverages; opt for bottled water.

Ex Output:
A


Ex Input:
A little boy is climbing up the stairs of a play gym, he stops once and points at a red tube opening but passes it. He gets to the red tube slide at the top and points to it and then slides down. once <sep> (A) he gets to the bottom, he waits, lifts his legs and slides but doesn't slide. (B) on the ground he walks around for a bit then turns around and points up. (C) on, he slides across it and has a great time sliding down. (D) he reaches the bottom, he comes up and grabs the gear that is underneath him and begins to slide back down.

Ex Output:
B


Ex Input:
[header] How to make your bedroom look cosy [title] Understand how color can change a room. [step] The color of your bedroom walls can have a big impact on how you feel. Warm colors like oranges, reds, yellows, and earth tones can make even large rooms feel cosy and intimate. <sep> (A) [title] Paint your bedroom a neutral color, like a beige, light brown, or white. [step] Blue/navy is also a calming colour to have in a bedroom. (B) [title] Position the furniture differently on each side of your bed. [step] Complement each sleeping arrangement with wall pillows and some nice blankets. (C) [substeps] Try throwing pillows or cushions in your colors before bed. Try to check out the color first, as it may make your bedroom a darker space. (D) Walls in dark tones like grays and brown can wear down dramatically. [title] Go for a fun yet modern look.

Ex Output:

A