In each of the following questions, a related pair of words is followed by four pairs of words or phrases. Select the pair that best expresses a relationship similar to the one expressed in the question pair.

Statute: Law

The correct answer is Proviso: clause.

Step-by-step Explanation:

1. Analyze the original pair (Statute: Law):
A statute is a formal written enactment of a legislative authority that governs a state, city, or country. In simple terms, a statute is a specific type or form of a law. Therefore, a statute is a category or synonym/specific instance of a law.

2. Evaluate the given options:

• Proviso: clause
A proviso is a condition or qualification attached to a agreement or document. In legal and formal terminology, a proviso is a specific type of clause. This exhibits the exact same relationship where the first term is a specific type/example of the second term.

• Chapter: exercise
A chapter may contain exercises, but a chapter is not a specific type of exercise.

• University: school
While both are educational institutions, a university is not simply a single type or clause of a school in the same structural/legal sense that a statute is to a law or a proviso is to a clause.

• Section: illustration
A section might contain an illustration, but a section is not a type of illustration.

Conclusion:
Just as a statute is a specific type of law, a proviso is a specific type of clause. Hence, the pair that best expresses a similar relationship is Proviso: clause.