Definition: 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: The word ale comes from Old English ealu (plural ealo), in turn from Proto-Germanic *alu (plural *alu), ultimately from the Proto-Indo-European base *helut-, which holds connotations of "sorcery, magic, possession, intoxication". The word beer comes from Old English beor, from Proto-Germanic *beuza, probably from Proto-Indo-European *beusom, originally "brewer's yeast, beer dregs", although other theories have been provided connecting the word with Old English beow, "barley", or Latin bibere, "to drink". On the currency of two words for the same thing in the Germanic languages, the 12th-century Old Icelandic poem Alvissmal says, "Ale it is called among men, but among the gods, beer."
Output:
What is the plural of the word ale?