You will be given a definition of a task first, then some input of the task.
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.

Passage: In Puerto Rico, various department stores have operated, such as Sears, JC Penney, Macy's, Kmart, Wal-Mart, Marshalls, Burlington Coat Factory, T.J. Maxx, Costco, Sam's Club and others. La New York was a Puerto Rican department store. Topeka, Capri and Pitusa are competitors on the Puerto Rican market that also have hypermarkets operating under their names. Retailers Nordstrom and Saks Fifth Avenue also have plans to come to the Mall of San Juan, a new high-end retail project with over 100 tenants. The mall is set to open in March 2015.
Output:
What department store in Puerto Rico isn't named after an American city?