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 recognize and prevent a hookworm infection [title] Be aware of who is most at risk. [step] Some people are more likely to come into contact with hookworm infection than others due to their work, play, or other habits. Those most at risk include : [substeps] People who come into direct contact with soil contaminated with human feces such as gardeners, builders, plumbers, etc. <sep> (A) People with bare hands are at a higher risk for contracting hookworm with other people. Hookworm is a viral infection, and your body will not effectively fight the bacteria that makes up the infection. (B) Keep in mind that hookworm infection can cause gastrointestinal issues and can worsen over time. Tell your family, friends, and professionals what you are at risk of and where you are at before they know about it. (C) Products that might carry the disease contact with bee stings or pollination that might be harmful to bees also through play. Anyone under the age of 12 is at a higher risk. (D) Children who frequently play outside barefoot, or who play in contaminated soil. [title] Recognize the symptoms of a hookworm infection.

Ex Output:
D


Ex Input:
[header] How to stretch to improve your flexibility [title] Warm up your muscles. [step] Perform 40 jumping jacks , 25 squats, run on the spot for 5 minutes, and ten press-ups or ten girl press-ups if you are not strong enough. [title] Start with simple stretches to get used to the concept and feeling of stretching. <sep> (A) [step] You can stretch on a ball or in the sky. Avoid attempting to do anything difficult or hard and figure out what you're doing properly. (B) [step] Does it feel to stretch? That is great. Start slow and do thirty chest presses before you reach bench pressing. (C) [step] Stretching is the single best way to exercise comfortably and to elevate your blood circulation. [title] Work your muscles with the backbend workouts. (D) [step] Stand up and stretch your legs into a wide straddle. Reach down until your palms rest on the ground, keeping your legs straight.

Ex Output:
D


Ex Input:
[header] How to use a double boiler [title] Gather your materials. [step] You will need both the bottom pot and the upper pot; you will not need the lid that came with your double boiler, unless the recipe or project specifically calls for one. If you do not have a double boiler, you can make your own using a large pot and a shallow, heat-resistant bowl that can fit over it. <sep> (A) [substeps] The bottom pot should be made of ceramic, as these are the most common, and should withstand high temperatures. The front pot should be made of glass, as these can get splashed with hot water. (B) [substeps] The bowl in your homemade double boiler should fit snugly onto the large pot. There should be no gaps or spaces between the bowl and the rim of the pot. (C) [substeps] The bottom pot should be big enough for two people to mix using, and must hold at least 1 cup (240 ml) of water in it. Place the container with the siphon filling in the bottom pot. (D) [substeps] You can use a large pot or pour boiling water in a smaller pot. Use a metal bowl if it can fit over the pot and then place your middle pot on top of the double boiler.

Ex Output:

B