Definition: In this task, you are given a premise sentence, two possible options and a question word. If the question was cause you should select the option that is a possible cause of the premise sentence, and if the question word was effect you should find the option which is a possible effect of the premise sentence. Answer with "A" or "B".
Input: My knees buckled on the stairs. (A) I caught myself on the railing. (B) The railing came loose from the wall., Question: effect

A