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:What substance, best known as a poison, was used in small doses in medications as a stimulant, as a laxative, and for enhancing performance in sports? ,  Options: [A.paracetemol B.strychnine] 
Student:
B