Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Question:Who was US Attorney General from January 1961 until September 1964 and a Senator for New York from January 1965 until June 1968? ,  Options: [A.Prescilla Rose B.Robert Francis Kennedy] 
Student:
B