[Q]: Marwin Javier Gonzalez (born March 14, 1989) is a Venezuelan professional baseball infielder with the Houston Astros of Major League Baseball (MLB). Primarily a shortstop, Gonzalez has appeared at every position except for pitcher and catcher for the Astros. He is in his forties.
[A]: No

[Q]: Studies in Mutualist Political Economy is a book on political economy published on 2007 by American mutualist anarchist Kevin Carson. In its preface Carson describes this work as "an attempt to revive individualist anarchist political economy, to incorporate the useful developments of the last hundred years, and to make it relevant to the problems of the twenty-first century." Studies in Mutualist Political Economy is for children.
[A]: It's impossible to say

[Q]: Jurgen Melzer (born 22 May 1981 in Vienna) is an Austrian tennis player. He reached a career-high singles ranking of world No. 8 in April 2011, and a doubles ranking of world No. 6 in September 2010. He is a left-handed tennis player, but is right-handed in everyday life. He has a younger brother, Gerald Melzer, with whom he has played doubles in several tournaments. There are Austrians that play tennis professionally.
[A]: Yes

[Q]: Keystone is an unincorporated community and census-designated place in central Keith County, Nebraska, United States. It lies along local roads near the North Platte River, northeast of the city of Ogallala, the county seat of Keith County. Its elevation is 3,100feet (945m). Although Keystone is unincorporated, it has a post office, with the ZIP code of 69144. Keystone is the largest unincorporated community in central Keith County, Nebraska with a post office.
[A]:
It's impossible to say