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:
A man is talking on a basketball court. he <sep> (A) picks up a bottle of water and takes a drink of the water. (B) shows how to play the volleyball. (C) then demonstrates how to throw a ball to the goal. (D) starts hit by the ball.

Ex Output:
A


Ex Input:
[header] How to wear rings [title] Use a ring-sizer to find the appropriate size for a ring. [step] Ring-sizers are plastic sheets with a variety of different sizes on them, which you can slide your finger into to find an appropriate fit. These are available at every jewelry counter for sizing rings. <sep> (A) [substeps] Your ring should fit your finger comfortably. It needs to be snug enough so that it stays on, but loose enough to slide off at the knuckle. (B) Use your ring-sizer to find a size that fits your finger size-which sounds easy. [substeps] A ring size 14-inch (27.6 cm) is approximately the ideal size, though it can add a mature look to a ring. (C) Many rings, especially those with 3 or more sizes, will fit comfortably onto your ring. [substeps] You can also do this freehand by simply finding a ring-sizer with a similar size. (D) When one is worn, do not buy one with rounded sides. This is likely to break or splinter, and it will probably have uva, bva, and uvb features of the ring.

Ex Output:
A


Ex Input:
[header] How to dry out a pimple [title] Ask your doctor about retinoid treatments. [step] Topical retinoids are gels or creams that you apply to your face as an acne treatment. They are an effective treatment for reducing acne. <sep> (A) These medications require a prescription from your doctor or dermatologist. [substeps] You will need to apply the medicine three times per week at first and then work up to applying it once per day as your skin adjusts to it. (B) [substeps] You do not need to reuse a prescription retinoid. If your pimple is severe enough to warrant medical treatment, the doctor may advise blocking pores that provide deeper or more serious damage to the acne. (C) With the residue of acne treated, the pimple may disappear on its own. [substeps] Retinoids can be applied twice a day for 2-4 weeks, twice a week for up to 6 weeks, or more if the pimple stays there for longer than a day. (D) They are usually applied to your pimple twice a day, once in the morning and once in the night. When your doctor is treating you, they will inject the retinoids into the dermis which is where you see the blemishes.

Ex Output:

A