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 Input: Question:Horatio was a legendary Roman hero who defended a bridge against which army? ,  Options: [A.Etruscan B.Tiber] 
Example Output: B

Example Input: Question:Ivan Galamian has had world-wide influence as a teacher of what? ,  Options: [A.Violin B.Guitar] 
Example Output: A

Example Input: Question:What celestial object was visited by the New Horizons spacecraft in 2015? ,  Options: [A.Mars B.pluto] 
Example Output:
B