Certified Sommelier Practice Exam 2025 - Free Certified Sommelier Practice Questions and Study Guide

Selection de Grains Nobles (SGN) wines are indeed defined by being made from grapes that are affected by botrytis, also known as noble rot. This fungal infection dehydrates the grapes, concentrating the sugars and flavors, which leads to the creation of rich, sweet wines with complex characteristics. The presence of botrytis is crucial in developing the unique profile typical of SGN wines, resulting in a luxurious taste and texture that wine aficionados highly appreciate.

The other options do not accurately define SGN wines. While aging in oak can complement the flavors of some sweet wines, it is not a prerequisite for all SGN wines. SGN wines are typically produced in limited quantities due to the specific vineyard requirements and the meticulous hand-harvesting process, making it incorrect to say they are produced only in large quantities. Lastly, SGN wines are predominantly still wines, not sparkling, distinguishing them from sparkling wine styles.