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: Machine vision systems often require bright and homogeneous illumination, so features of interest are easier to process. LEDs are often used for this purpose, and this is likely to remain one of their major uses until the price drops low enough to make signaling and illumination uses more widespread. Barcode scanners are the most common example of machine vision, and many low cost products use red LEDs instead of lasers. Optical computer mice are an example of LEDs in machine vision, as it is used to provide an even light source on the surface for the miniature camera within the mouse. LEDs constitute a nearly ideal light source for machine vision systems for several reasons:

Ex Output:
 non-LEDs are often used for what type of systems?


Ex Input:
Passage: First recognized in 1900 by Max Planck, it was originally the proportionality constant between the minimal increment of energy, E, of a hypothetical electrically charged oscillator in a cavity that contained black body radiation, and the frequency, f, of its associated electromagnetic wave. In 1905 the value E, the minimal energy increment of a hypothetical oscillator, was theoretically associated by Einstein with a "quantum" or minimal element of the energy of the electromagnetic wave itself. The light quantum behaved in some respects as an electrically neutral particle, as opposed to an electromagnetic wave. It was eventually called the photon.

Ex Output:
In what year was the value G associated by Einstein with quantum theories of energy?


Ex Input:
Passage: After Mary continued in the "blood of her purifying" another 33 days for a total of 40 days, she brought her burnt offering and sin offering to the Temple in Jerusalem,[Luke 2:22] so the priest could make atonement for her sins, being cleansed from her blood.[Leviticus 12:1-8] They also presented Jesus –  "As it is written in the law of the Lord, Every male that openeth the womb shall be called holy to the Lord" (Luke 2:23other verses). After the prophecies of Simeon and the prophetess Anna in Luke 2:25-38 concluded, Joseph and Mary took Jesus and "returned into Galilee, to their own city Nazareth".[Luke 2:39]

Ex Output:

How many days did Mary bring her burnt offering and sin offering to the Temple in Jerusalem?