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 clean sperrys [title] Remove caked-on dirt with a bristle brush. [step] Using a soft toothbrush or a bristle brush made for leather, gently brush away any dirt, dust, or debris. Brush the leather with soft strokes in the same direction. <sep> (A) [substeps] Brushing the pricier areas first helps to allow for better handling of all surfaces. [title] Dust the back and sides of the flaked-off parts with a lint-free cloth. (B) If you scrub the shoes in multiple directions, you're likely to leave scars. [substeps] Use a rubber-bristled brush rather than a nylon-bristled brush. (C) [substeps] When applying pressure, make sure to keep the bristles away from your sperrys' feathers. It helps to remove any stuck on insects. (D) [substeps] Sweep or wipe off any grime stuck to the surface. Dry the area with a soft cloth or a clean towel afterwards.

Ex Output:
B


Ex Input:
A man is pushing a lawn mower through the grass. A child is standing next to him pushing a toy lawn mower. they <sep> (A) speed past a car in the street. (B) pass other kids on the lawn mower. (C) move up and down the lawn on the mower. (D) give each other a high five.

Ex Output:
D


Ex Input:
[header] How to evolve porygon [title] Obtain an up-grade. [step] You will need to give this item to porygon to hold. When porygon is traded while holding an up-grade, it will evolve into porygon2. <sep> (A) All you'll need to sell porygon2 is the final cure for ugali. [substeps] Poisson's final cure is 5 , 000 gold; this way, porygon2 will unlock your poisson's maximum cure by dropping 100 gold. (B) You can trade it for one high-grade tablet, or the combination of various previously traded tablets. This is pretty heavy trading as some tablets are sold for much less than others, requiring much more money. (C) This is the non-optimal type of porygon2 you will need to get. [substeps] You will need to trade porygon2 for an up-grade. (D) You can get an up-grade in gen 2 (gold, silver, crystal) and later. [title] Equip porygon with the up-grade item.

Ex Output:

D