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 lance and drain a blister [title] Assess the blister before choosing to drain it. [step] Not every blister needs to be lanced. In fact, some experts recommend that you should only drain blisters that are exceedingly painful, in weight-bearing or high-contact areas, or larger than 0.8 inches (2 centimeters) in diameter. <sep> (A) [substeps] If the blister is intact and manageable, try to keep it intact. Apply a piece of moleskin, adhesive felt, or tape. (B) In these instances, you need to check the blister to determine if it needs a leak-proof drain. [substeps] See the " how to drain a blister " section of this article for instructions. (C) [title] Make a decision whether or not to drain the blister. [step] If the blister is very painful, medical sterilization is an option. (D) [substeps] There is no one right way to do this, so you have to be sure that you have the right technique. It is not as easy to clean a blister as to rinse with water and applying a sterile dressing.

Ex Output:
A


Ex Input:
[header] How to band a goat [title] Purchase an elastrator from a farm and ranch supply store. [step] It is a metal tool that is used to secure the rubber band around the scrotum. [title] Buy castration bands. <sep> (A) [step] They can be purchased from your local farm supply store or from a municipal livestock supply store. [title] Buy a leather or gauze band. (B) [step] Don't use household office supplies for banding. The bands should be thick enough and tight enough to lead to castration within a few weeks. (C) [step] These are simple, metal with metal screws, two prongs, and a ribbon loop on either end. [title] Cut a small hole in each long length of the band. (D) [step] It is a device that attaches the separate rubber bands, wires, tubing and pieces of cork/plastic. It is available at local farm supply stores, ranch supply stores and hardware stores.

Ex Output:
B


Ex Input:
[header] How to use the rear view mirror [title] Position your seat. [step] Before you adjust your mirror, you want to make sure that your seat is in the right position for driving. Move the seat forward or back, adjust the seat back, and move the seat up or down, if your seat has that type of adjustment. <sep> (A) [substeps] You may need to experiment, but usually, most seats will adjust the mirror for you. For example, if you can adjust the wheel so that it faces slightly forward, that's a great move for a car with a full rear view mirror. (B) [substeps] Most cars have the mirrors checked at their appropriate position prior to deployment. [title] Find your pre600 angle angle. (C) [substeps] The outside parts of the body of the car, such as the pedals and headlights, should be aligned. Further, you should check your speedometer or your mirrors to see if you are in the right position. (D) [substeps] It's important to adjust the seat so that you can easily reach the pedals of the car. Make sure your feet can reach the gas pedal, the brake pedal, and, if you have one, the clutch pedal.

Ex Output:

D


