Which cocktail contains both vodka and Kahlua?

The cocktail that contains both vodka and Kahlua is the Black Russian. This classic drink consists primarily of these two ingredients, with vodka serving as the main spirit and Kahlua contributing a sweet coffee liqueur flavor. The combination creates a rich and bold cocktail that balances the neutral profile of vodka with the aromatic complexity of Kahlua.

While other cocktails mentioned in the options incorporate different ingredients or variations, they do not feature both vodka and Kahlua. The White Russian, although it also contains vodka and Kahlua, includes cream as well, differentiating it from the simpler Black Russian. The Godmother typically consists of vodka and Amaretto, while the Negroni is purely a gin, Campari, and sweet vermouth cocktail. Thus, the Black Russian stands out as the correct answer focusing specifically on the inclusion of both vodka and Kahlua without additional components.