What type of grape is exclusively used for wine production in Condrieu?

Condrieu is renowned for its white wines, which are made exclusively from the Viognier grape. This varietal is characterized by its aromatic profile, often exhibiting notes of stone fruits such as apricot, along with floral hints and a luscious texture. The unique terroir of the Condrieu region, with its steep granite slopes and warm climate, significantly contributes to the quality and complexity of Viognier wines produced there. This exclusivity in grape variety is a key aspect of Condrieu's identity, differentiating it from other wine regions that may blend various grape types.

The other options listed do not apply to Condrieu: Grenache and Mourvèdre are primarily used in regions such as the Southern Rhône for red wines, while Syrah is more prominent in nearby regions like Côte-Rôtie. Thus, the use of Viognier is what distinctly categorizes the wines of Condrieu.