Definition: The answer will be 'yes' if the provided sentence contains an explicit mention that answers the given question. Otherwise, the answer should be 'no'. Instances where the answer is implied from the sentence using "instinct" or "common sense" (as opposed to being written explicitly in the sentence) should be labeled as 'no'.
Input: Sentence: This time, however, the anonymous artist worked in tandem with the director of Bristol museum in the UK. 
Question: How often had they worked together before?

Yes.