instruction:
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.
question:
Passage: Comcast is sometimes described as a family business. Brian L. Roberts, Chairman, President, and CEO of Comcast, is son of co-founder Ralph Roberts. Roberts owns or controls just over 1% of all Comcast shares but all of the Class B supervoting shares, which gives him an "undilutable 33% voting power over the company". Legal expert Susan P. Crawford has said this gives him "effective control over its [Comcast's] every step". In 2010, he was one of the highest-paid executives in the United States, with total compensation of about $31 million.
answer:
Who is Brian L. Robert's son?


question:
Passage: Even though some proofs of complexity-theoretic theorems regularly assume some concrete choice of input encoding, one tries to keep the discussion abstract enough to be independent of the choice of encoding. This can be achieved by ensuring that different representations can be transformed into each other efficiently.
answer:
What can not be achieved by ensuring different representations can transformed into each other efficiently?


question:
Passage: There is very little voice acting in the game, as is the case in most Zelda titles to date. Link remains silent in conversation, but grunts when attacking or injured and gasps when surprised. His emotions and responses are largely indicated visually by nods and facial expressions. Other characters have similar language-independent verbalizations, including laughter, surprised or fearful exclamations, and screams. The character of Midna has the most voice acting—her on-screen dialog is often accompanied by a babble of pseudo-speech, which was produced by scrambling the phonemes of English phrases[better source needed] sampled by Japanese voice actress Akiko Kōmoto.
answer:

Through what can Link's verbalizations be discerned?