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: Consider Input: Passage: Hoover began using wiretapping in the 1920s during Prohibition to arrest bootleggers. In the 1927 case Olmstead v. United States, in which a bootlegger was caught through telephone tapping, the United States Supreme Court ruled that FBI wiretaps did not violate the Fourth Amendment as unlawful search and seizure, as long as the FBI did not break into a person's home to complete the tapping. After Prohibition's repeal, Congress passed the Communications Act of 1934, which outlawed non-consensual phone tapping, but allowed bugging. In the 1939 case Nardone v. United States, the court ruled that due to the 1934 law, evidence the FBI obtained by phone tapping was inadmissible in court. After the 1967 case Katz v. United States overturned the 1927 case that had allowed bugging, Congress passed the Omnibus Crime Control Act, allowing public authorities to tap telephones during investigations as long as they obtain a warrant beforehand.

Output: When did Hoover stop using wiretapping?


Input: Consider Input: Passage: A typical traditional Eritrean dish consists of injera accompanied by a spicy stew, which frequently includes beef, kid, lamb or fish. Overall, Eritrean cuisine strongly resembles those of neighboring Ethiopia, Eritrean cooking tend to feature more seafood than Ethiopian cuisine on account of their coastal location. Eritrean dishes are also frequently "lighter" in texture than Ethiopian meals. They likewise tend to employ less seasoned butter and spices and more tomatoes, as in the tsebhi dorho delicacy.

Output: What kind of food is injera?


Input: Consider Input: Passage: The Glastonbury Festival of Contemporary Performing Arts takes place most years in Pilton, near Shepton Mallet, attracting over 170,000 music and culture lovers from around the world to see world-famous entertainers. The Big Green Gathering which grew out of the Green fields at the Glastonbury Festival is held in the Mendip Hills between Charterhouse and Compton Martin each summer. The annual Bath Literature Festival is one of several local festivals in the county; others include the Frome Festival and the Trowbridge Village Pump Festival, which, despite its name, is held at Farleigh Hungerford in Somerset. The annual circuit of West Country Carnivals is held in a variety of Somerset towns during the autumn, forming a major regional festival, and the largest Festival of Lights in Europe.


Output: How many people attend the Bath Literature Festival each year?