Given the task definition, example input & output, solve the new input case.
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".
Example: The animal species became endangered. (A) Their habitat was destroyed. (B) Their predators went extinct., Question: cause
Output: A
The question word is cause, so we should find the possible cause of the premise. Option A can be the cause of the premise, and the output should be "A".

New input case for you: I flipped the light switch up and down. (A) The light faded. (B) The light flickered., Question: effect
Output:
B