Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Context : Marijke Schaar (born 12 November 1944), also known under her maiden name Marijke Jansen, is a former Dutch female tennis player who was active during the 1960s and 70s.
Answer : female
What sex is Marijke Schaar?

Context : Production of the 2S5 Giatsint-S started in 1976 along with the towed version the 2A36 Giatsint-B. It was introduced into service in 1978 and has also been known as the M1981 by the United States.
Answer : 1978
What year did 2S5 Giatsint-S come into use?

Context : Ludwik Gross (September 11, 1904 -- July 19, 1999) was a Polish-American virologist who discovered two different tumor viruses, murine leukemia virus and mouse polyomavirus, capable of causing cancers in laboratory mice.
Answer : virologist
What was Ludwik Gross's occupation?