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 Q]: [header] How to remove hair from your throat [title] Try to swallow the hair. [step] If you suspect that you have one or two hairs stuck in your throat, try to just swallow them. The hair will travel through your digestive tract like food does and your body will excrete them. <sep> (A) Pass the hair around your mouth under your tongue until you see no more hairs. It's important that you close your mouth as tightly as possible so that the hairs don't come back. (B) Sucking in the hair will leave your throat full of the hair. If the hairs are stuck in your throat, then you might want to rub a cotton ball or toilet paper over your throat to help get rid of the hairs. (C) This will open up the glycerine lining in your throat and prevent anything from coming out. [substeps] Wait a few minutes to see if they're gone. (D) Your body will not break down the hair because it's made of keratin, a dense protein. [substeps] If it feels like the hair is long, see if you can use your clean fingers to pull the hair out of your throat.
[EX A]: D

[EX Q]: [header] How to buy a blackhead remover [title] Learn your options. [step] You should not squeeze or pick at blackhead, as this can lead to infection or scarring. However, you can remove pesky or unsightly blackheads with several different types of products that may not necessarily irritate your skin or require treating it with chemicals. <sep> (A) Learning your different options can help you identify the best product for your specific blackhead removal needs. Products that can remove blackheads include : [substeps] Extractor tools pore strips clay masks topical creams [title] Identify the best remover for your skin type. (B) For example, cleansing a burnt face can peel pores, like blackheads, and subtly remove blackheads. Deep pore pimples, which are a common factor for blackheads, are not tended to dry out. (C) [substeps] Avocado, keratin, and brewer's yeast all work well in reducing the inflammation and scarring of blackheads. [title] Pick a chemical neutralizer for stubborn blackheads. (D) Some of the well known brands that are known for their blackheads include tootane, steam, huawba, and celandine. As noted above, these products are more environmentally friendly than other skincare products, especially for those kids.
[EX A]: A

[EX Q]: [header] How to tie a swiss seat rappel harness [title] Find the center of the rope by folding it in half and going to the fold. [step] Place the fold in the center of your lower back, ends out to either side of your body so that you're holding an equal length in each hand. [title] Cross the halves in front of you so that it wraps around your waist. <sep> (A) [step] Pull one side under the other to make a half hitch. Repeat so that the rope turns twice around itself. (B) [title] Draw a mark across the center of the rope which tells you where to draw the knot. [title] Cut out the mark with a double, clean razor blade. (C) [step] Make sure to place the end in the center of the collar, facing your waist. You should now be lying face down on the ground with the knot in the center of the collar. (D) [step] You'll be looping the rope through your belt, so don't worry-you'll be hooking the bottom cross to your top one. [title] Tie the second cross over the first one and tie it.
[EX A]:
A