Given the task definition, example input & output, solve the new input case.
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.
Example: Question:Who was the man behind The Chipmunks? ,  Options: [A. David Seville, B. Alvin Seville] 
Output: A
David Seville was the man behind the Chipmunks. So, the correct answer is A.

New input case for you: 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