Which fruit is described as a sour yellow fruit?

The fruit described as a sour yellow fruit is lemon. Lemons are known for their distinctive tartness and high acidity, which gives them their sour flavor profile. They are bright yellow in color, often used in culinary applications for flavoring dishes, beverages, and desserts. Additionally, lemons are rich in vitamin C and have various health benefits.

On the other hand, bananas are sweet and typically yellow when ripe, but not sour. Grapes can be sweet or tart depending on the variety but do not typically present the strong sourness associated with lemons. Apples come in various flavors, including sweet and tart, but they are not predominantly sour or exclusively yellow, as they can be red or green as well.