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.

[Q]: Question:Which of the Queen's horses won the 2013 Ascot Gold Cup? ,  Options: [A.Estimate B.Average] 
[A]: A


[Q]: Question:What does the proofreading notation stet mean? ,  Options: [A.copy editing B.let it stand or ignore indicated edit mark] 
[A]: A


[Q]: Question:One of the longest ruling monarchs of the 20th century and a massive and dangerous volcano in the USA share which name? ,  Options: [A.Columbus B.Rainer] 
[A]:
B