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.

Ex Input:
Passage: Subsequently, in October 2001, U.S. forces (with UK and coalition allies) invaded Afghanistan to oust the Taliban regime. On 7 October 2001, the official invasion began with British and U.S. forces conducting airstrike campaigns over enemy targets. Kabul, the capital city of Afghanistan, fell by mid-November. The remaining al-Qaeda and Taliban remnants fell back to the rugged mountains of eastern Afghanistan, mainly Tora Bora. In December, Coalition forces (the U.S. and its allies) fought within that region. It is believed that Osama bin Laden escaped into Pakistan during the battle.

Ex Output:
What city fell by mid-October in the invasion of Afghanistan? 


Ex Input:
Passage: Development of the fertilized eggs is direct, in other words there is no distinctive larval form, and juveniles of all groups generally resemble miniature cydippid adults. In the genus Beroe the juveniles, like the adults, lack tentacles and tentacle sheaths. In most species the juveniles gradually develop the body forms of their parents. In some groups, such as the flat, bottom-dwelling platyctenids, the juveniles behave more like true larvae, as they live among the plankton and thus occupy a different ecological niche from their parents and attain the adult form by a more radical metamorphosis, after dropping to the sea-floor.

Ex Output:
How does the larvae develop?


Ex Input:
Passage: This allowed any English firm to trade with India, unless specifically prohibited by act of parliament, thereby annulling the charter that had been in force for almost 100 years. By an act that was passed in 1698, a new "parallel" East India Company (officially titled the English Company Trading to the East Indies) was floated under a state-backed indemnity of £2 million. The powerful stockholders of the old company quickly subscribed a sum of £315,000 in the new concern, and dominated the new body. The two companies wrestled with each other for some time, both in England and in India, for a dominant share of the trade.

Ex Output:

What caused English firms to be forbidden to trade with India unless?