Certified Sommelier Test 2026 – 400 Free Practice Questions to Pass the Exam

In the Dao region of Portugal, the minimum percentage of Touriga Nacional required in red wines is indeed 20%. Touriga Nacional is one of the key grape varieties cultivated in this region, known for its quality and contribution to the complexity and character of the wines produced there. The regulation stipulates that in order to be labeled as a Dao red wine, producers must include at least 20% of this variety in their blends. This establishes a requirement that aims to preserve the regional identity and ensure a baseline quality associated with the wine's characteristics.

The other percentages listed do not align with the current regulations for red wines from the Dao region. A threshold lower than 20% would not guarantee the distinctive qualities that Touriga Nacional provides. Similarly, higher percentages like 50% or 90% do not reflect the flexibility allowed in blending, which often involves other local grape varieties to create a well-rounded product while still emphasizing Touriga Nacional's importance in the blend.