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.

Example Input: Passage: For more than 40 years, Paul Ekman has supported the view that emotions are discrete, measurable, and physiologically distinct. Ekman's most influential work revolved around the finding that certain emotions appeared to be universally recognized, even in cultures that were preliterate and could not have learned associations for facial expressions through media. Another classic study found that when participants contorted their facial muscles into distinct facial expressions (e.g. disgust), they reported subjective and physiological experiences that matched the distinct facial expressions. His research findings led him to classify six emotions as basic: anger, disgust, fear, happiness, sadness and surprise.
Example Output: Who has agreed that emotions are discrete?

Example Input: Passage: The time and space hierarchy theorems form the basis for most separation results of complexity classes. For instance, the time hierarchy theorem tells us that P is strictly contained in EXPTIME, and the space hierarchy theorem tells us that L is strictly contained in PSPACE.
Example Output: What does not form the basis for most separation results of complexity classes?

Example Input: Passage: Based on the strength of his work, Universal signed Spielberg to do four TV films. The first was a Richard Matheson adaptation called Duel. The film is about a psychotic Peterbilt 281 tanker truck driver who chases the terrified driver (Dennis Weaver) of a small Plymouth Valiant and tries to run him off the road. Special praise of this film by the influential British critic Dilys Powell was highly significant to Spielberg's career. Another TV film (Something Evil) was made and released to capitalize on the popularity of The Exorcist, then a major best-selling book which had not yet been released as a film. He fulfilled his contract by directing the TV film-length pilot of a show called Savage, starring Martin Landau. Spielberg's debut full-length feature film was The Sugarland Express, about a married couple who are chased by police as the couple tries to regain custody of their baby. Spielberg's cinematography for the police chase was praised by reviewers, and The Hollywood Reporter stated that "a major new director is on the horizon.":223 However, the film fared poorly at the box office and received a limited release.
Example Output:
Who starred in Duel as the tanker truck driver?