Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
During the 19th century, Karl Marx and Friedrich Engels extended the concept of materialism to elaborate a materialist conception of history centered on the roughly empirical world of human activity (practice, including labor) and the institutions created, reproduced, or destroyed by that activity (see materialist conception of history). Later Marxists developed the notion of dialectical materialism which characterized later Marxist philosophy and method.
What type of materialism did not define the Marxist philosophy?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
During the 20th century, the county became increasingly urbanised, particularly the southern part. To the existing county boroughs of Barrow-in-Furness, Blackburn, Bolton, Bootle, Burnley, Bury, Liverpool, Manchester, Oldham, Preston, Rochdale, Salford, St Helens and Wigan were added Blackpool (1904), Southport (1905), and Warrington (1900). The county boroughs also had many boundary extensions. The borders around the Manchester area were particularly complicated, with narrow protrusions of the administrative county between the county boroughs – Lees urban district formed a detached part of the administrative county, between Oldham county borough and the West Riding of Yorkshire.
When was the county borough of Liverpool created?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Despite the lack of a coastline, Punjab is the most industrialised province of Pakistan; its manufacturing industries produce textiles, sports goods, heavy machinery, electrical appliances, surgical instruments, vehicles, auto parts, metals, sugar mill plants, aircraft, cement, agricultural machinery, bicycles and rickshaws, floor coverings, and processed foods. In 2003, the province manufactured 90% of the paper and paper boards, 71% of the fertilizers, 69% of the sugar and 40% of the cement of Pakistan.
What percentage of textiles does Punjab export?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Phonetically in some languages, such as Navajo, aspiration of stops tends to be realised as voiceless velar airflow; aspiration of affricates is realised as an extended length of the frication.
In Navajo, the aspiration of affricates can be seen as what?
A:
an extended length of the frication