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:
People are playing a game where they hit a ball with a stick. A man is seen sitting on the grass behind a goal. a m an <sep> (A) couple is standing next to the goal area. (B) a segment has two men standing before him holding a ball. (C) is holding a bottle and a pitcher of juice. (D) a little girl runs and throws the ball to a man sitting on the grass.

Ex Output:
C

Ex Input:
[header] How to avoid constipation when taking temodar (temozolomide ) [title] Stay hydrated. [step] Drinking water (and other non-caffeinated liquids) is very important to avoid constipation. Unless your doctor told you to restrict your fluids, regularly drink 8-12 cups daily of fluids like water, decaf tea, warm lemonade, or prune juice. <sep> (A) Water also contains calcium, potassium, and vitamin c. consuming more water can prevent constipation and slowly decrease the likelihood of constipation. (B) You can sip these items without warping your bowels. [title] Take a second to check for constipation. (C) The fluids in these water glasses can help to prevent constipation and keep your esophagus and your intestines hydrated. [title] Replace the capsules every 2 weeks. (D) Water can also help flush out excess toxins from chemotherapy. [substeps] Aim to drink 2-3 quarts of fluid every 24 hours.

Ex Output:
D