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 make silver nitrate [title] Wear proper protective equipment. [step] The chemicals necessary for this process are highly toxic and can lead to injury if not handled properly. Eye protection, gloves, and a lab coat are necessary to remain safe. <sep> (A) You should also wear long, loose sleeves or long pants to protect yourself from these hazardous chemicals. Be sure you wear good quality work clothes. (B) Long pants and closed-toe shoes, preferably without mesh, should be worn to protect against floor spills. [substeps] Eye protection should completely cover your eyes and the sides of your eyes to protect from splashes. (C) Your lab coat can protect your skin and prevent pollution while working. Ask your local hazardous waste management company to provide you with an appropriate safety gear. (D) Wear full, protective safety gear as well to get the job done effectively. [title] Choose a location for your lab lab.

Ex Output:
B


Ex Input:
A person is standing in the bathroom with a green and yellow glove on their right hand and begins cleaning the sink with a sponge. a man <sep> (A) kneels down next to the sink dabbing at the faucet and then sprays the man with a spray head solution. (B) points the back of the let the woman clean and it cleans her empty bath tub. (C) then appears in what seems to be his bedroom and begins playing the guitar and the video then goes back to the person cleaning the sink. (D) kneels down in front of a sink full of beige clothing and begins grooming the foot of a dog on top of it.

Ex Output:
C


Ex Input:
[header] How to build a dog house [title] Consider what you'll be using the base for. [step] Different dogs have different needs, but almost every dog will need the following: an insulated, dry space that he can call home whether it's hot or cold. Pay attention to these factors when building a dog house : [substeps] Think about insulation. <sep> (A) Remember that the base builds the foundation for the whole house and creates a space of air between the ground and the floor that acts as insulation for the house. A house without a base is cooler during the cold months and warmer during the hot months. (B) Dogs are very sensitive to sunlight and it can take up to four years before a dog's house warms up completely. In addition, dogs with cones are more suitable for dens or sheds because of their sensitive skin and introverted personality. (C) Dogs love dry weather and are notorious for overheating. What you decide to use is up to you. (D) Dogs love warm spaces, so they can grow warm inside a house if the house is just low enough. If it's hot, consider covering the bottom of the house with individual shingles or hammering along the edges.

Ex Output:

A