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.
Q: Passage: Other pre-modern Chinese names for Tibet include Wusiguo (Chinese: ; pinyin: Wusiguo; cf. Tibetan dbus, U, [wy]), Wusizang (Chinese: ; pinyin: wusizang, cf. Tibetan dbus-gtsang, U-Tsang), Tubote (Chinese: ; pinyin: Tubote), and Tanggute (Chinese: ; pinyin: Tanggute, cf. Tangut). American Tibetologist Elliot Sperling has argued in favor of a recent tendency by some authors writing in Chinese to revive the term Tubote (simplified Chinese: ; traditional Chinese: ; pinyin: Tubote) for modern use in place of Xizang, on the grounds that Tubote more clearly includes the entire Tibetan plateau rather than simply the Tibet Autonomous Region.[citation needed]
A:
Who was Sperling Elliot?