The answer is C. Lawyer : Court.
In the other three pairs, the first word is a person who specializes in a particular field, and the second word is a place where that person works. A beautician specializes in beauty treatments, and a parlour is a place where beauty treatments are given. A chemist specializes in chemistry, and a laboratory is a place where chemistry is done. An engineer specializes in engineering, and a site is a place where engineering is done.
A lawyer, on the other hand, is not a person who specializes in courts. Lawyers specialize in law, and they can work in a variety of settings, including courts, law firms, and government agencies.