Final answer:
MAO inhibitors target specific enzymes, with MAO-B inhibitors targeting the enzyme monoamine oxidase B. Nonselective inhibitors block both MAO-A and MAO-B.
Step-by-step explanation:
MAO-inhibitors, or monoamine oxidase inhibitors, are a group of drugs that block the enzyme monoamine oxidase. There are two types of MAOIs: MAO-A inhibitors and MAO-B inhibitors. MAO-A inhibitors target the enzyme monoamine oxidase A, while MAO-B inhibitors target the enzyme monoamine oxidase B.
Nonselective inhibitors are inhibitors that block both MAO-A and MAO-B. They are not specific to either enzyme and have a broader mechanism of action compared to selective inhibitors.