You will be given a definition of a task first, then some input of the task.
This task involves asking a question, providing a set of 2 options. You are expected to choose the best answer to the question. The output will be in the form of A or B, corresponding to which option is chosen.

Question:What were Operation Ranger, Operation Buster-Jangle, Operation Tumbler-Snapper, Operation Upshot-Knothole and Operation Teapot? ,  Options: [A.Operation B.Nuclear test series carried out in the USA] 
Output:
A