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". 

Example Input: We see the man sitting on the floor talking to a camera. We see the man illustrating break dance moves. The man is talking and sitting still. we <sep> (A) see the man walking through the crowd at room 15 taking pictures. (B) see the man dance fast. (C) see the closing screen and a lady walks into frame. (D) see the following title screen.
Example Output: B

Example Input: [header] How to know if you have glaucoma [title] Schedule regular eye exams. [step] Open-angle glaucoma leads to the gradual deterioration of your vision over an extended period of time, usually years. Most people suffering from open-angle fail to notice symptoms until the glaucoma is very advanced and nerve damage has occurred. <sep> (A) [substeps] Glaucoma is usually attributed to a condition called retinopausal glaucoma. Doctors often refer patients with retinopausal glaucoma to psychotherapy or therapy. (B) The overall diagnosis is: glaucoma can present in two patterns: primary and secondary. Secondary glaucoma reverses almost any natural condition and the simplest way to identify glaucoma is to get three to four eye exams in a normal week. (C) [substeps] It is important to schedule eye exams every year, especially if you are over the age of 40 or have a family history or glaucoma. Open-angle is the most common type of glaucoma in the united states, affecting over 2 million people. (D) Checking your eye closely is often the first step to identifying the signs of open-angle glaucoma. [substeps] Schedule a yearly eye exam using a variety of tools.
Example Output: C

Example Input: A cat is on the screen with a title of the video. A dog and cat are walking along a brick sidewalk. they <sep> (A) are sitting on a pile of dog poo as they sit on their leashes. (B) begin to clip the cats nails with objects. (C) are blended together into the sidewalk. (D) pass some puddles and keep walking.
Example Output:
D