You are given a sentence, a question and two answer options ('A' and 'B'). Your task is to find the correct answer (return the string of the correct option, not 'A' or 'B') for the given question.
Q: Sentence: A salmon swimming through a river experiences low friction, while a salmon swimming through a creek experiences high friction. Question: Which river causes the temperature of the salmon to increase more? (A) river (B) creek
A:
creek