Select the word that means 'on both sides.'
Correct Answer: A
Rationale: The correct answer is 'bilateral.' 'Bilateral' means existing on or involving both sides. The term 'insufficient' refers to not being enough, 'bicuspid' is specific to a type of tooth, and 'congruent' denotes being in agreement or harmony. Therefore, 'bilateral' best conveys the meaning 'on both sides.' This term is commonly used in various contexts, such as bilateral agreements (involving two sides), bilateral symmetry (having two similar halves), and bilateral trade (commerce between two countries). Understanding the meaning of 'bilateral' is important as it is frequently encountered in different fields like politics, biology, and international relations.
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