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:
We see a person sharpen a knife on a sanding disc. The person touches it and turns it off. The person turns it on and then off off. we <sep> (A) see the person sharpening the knife on a cookie sheet. (B) see a man run in slow motion. (C) then see the title screen. (D) see the man talking to the camera.

Ex Output:
D


Ex Input:
Woman is standing in a room laying on the wall holding socks and putthing them on the feet. The woman put the brown boots on the right shoe and tie the laces. the woman <sep> (A) grabs the other shoe and put it on the left foot and tie the laces. (B) put the bent shoe on top of the head again and bend the other side using green tool. (C) also put the blue jacket on the left shoe and adjust the jacket with the left leg and the right knee. (D) puts the black socks with the green, grey, white laces on the feet.

Ex Output:
A


Ex Input:
[header] How to make tryptic soy agar (tsa ) [title] Using the marker and tape label the flask with your name, the date and the name of the solution (tsa). [title] Carefully slide the large magnetic stir-bar into the erlenmeyer flask. [title] Measure 500 ml of distilled water with the graduated cylinder. <sep> (A) [title] Once the mixture is properly mixed, insert the acetic nut into the chamber of the flask, and lift out the lid of the syringe. [title] Thread the brush of the winding mechanism through the locking piece and plug the cap on. (B) [title] Pour 500 ml of distilled water from the graduated cylinder into the erlenmeyer flask. [title] Place metal cap on the flask. (C) [step] Be careful not to let the water float in the flask. [title] Put measured percentage of the liquid into the flask. (D) [title] Add five teaspoons of corn syrup into the end of the stirring device. [title] Close the swirl cap on the stir bar.

Ex Output:

B