Instructions: This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.
Input: Passage: Arsenal's financial results for the 2014–15 season show group revenue of £344.5m, with a profit before tax of £24.7m. The footballing core of the business showed a revenue of £329.3m. The Deloitte Football Money League is a publication that homogenizes and compares clubs' annual revenue. They put Arsenal's footballing revenue at £331.3m (€435.5m), ranking Arsenal seventh among world football clubs. Arsenal and Deloitte both list the match day revenue generated by the Emirates Stadium as £100.4m, more than any other football stadium in the world.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Who ranks first in revenue for world football clubs?