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:After the murder of his children's nanny, Sandra Rivett, Richard John Bingham disappeared on 8 November 1974, was presumed deceased on 11 December 1992 and declared legally dead in October 1999. By what name is he better known? ,  Options: [A.Richard Bingham B.Alexander Aizenshtat] 
A: 
B