Q: Is the question "How is carbon dioxide removed from natural gas ?" asking about an entity, an abbreviation, a description, a human, a location, or a numeric entity?
A: description

Q: Is the question "What is hydroelectricity ?" asking about an entity, an abbreviation, a description, a human, a location, or a numeric entity?
A: description

Q: Is the question "Who were the only two bald U.S. Presidents ?" asking about an entity, an abbreviation, a description, a human, a location, or a numeric entity?
A: human

Q: Is the question "What is the difference between a classical and an acoustic guitar ?" asking about an entity, an abbreviation, a description, a human, a location, or a numeric entity?
A:
description