Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Paper made from mechanical pulp contains significant amounts of lignin, a major component in wood. In the presence of light and oxygen, lignin reacts to give yellow materials, which is why newsprint and other mechanical paper yellows with age. Paper made from bleached kraft or sulfite pulps does not contain significant amounts of lignin and is therefore better suited for books, documents and other applications where whiteness of the paper is essential.
What does paper made from sulfite pulps contain a significant amount of?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Presbyterian government is by councils (known as courts) of elders. Teaching and ruling elders are ordained and convene in the lowest council known as a session or consistory responsible for the discipline, nurture, and mission of the local congregation. Teaching elders (pastors) have responsibility for teaching, worship, and performing sacraments. Pastors are called by individual congregations. A congregation issues a call for the pastor's service, but this call must be ratified by the local presbytery.
Who calls ruling elders?
A: unanswerable

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Drama is literature intended for performance. The form is often combined with music and dance, as in opera and musical theatre. A play is a subset of this form, referring to the written dramatic work of a playwright that is intended for performance in a theatre; it comprises chiefly dialogue between characters, and usually aims at dramatic or theatrical performance rather than at reading. A closet drama, by contrast, refers to a play written to be read rather than to be performed; hence, it is intended that the meaning of such a work can be realized fully on the page. Nearly all drama took verse form until comparatively recently.
What does a closest drama refer to?
A: unanswerable

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Legislatures have reduced infringement by narrowing the scope of what is considered infringing. Aside from upholding international copyright treaty obligations to provide general limitations and exceptions, nations have enacted compulsory licensing laws applying specifically to digital works and uses. For example, in the U.S., the DMCA, an implementation of the 1996 WIPO Copyright Treaty, considers digital transmissions of audio recordings to be licensed as long as a designated copyright collective's royalty and reporting requirements are met. The DMCA also provides safe harbor for digital service providers whose users are suspected of copyright infringement, thus reducing the likelihood that the providers themselves will be considered directly infringing.
Besides upholding international treaty, what else haven't countries done specifically to digital works and uses?
A:
unanswerable