Which food source is rich in vitamin B2?

Milk is rich in vitamin B2, also known as riboflavin. This vitamin plays a crucial role in energy production and the metabolism of fats, drugs, and steroids. It is also important for maintaining healthy skin, eyes, and nerve functions. Dairy products like milk are significant sources of riboflavin, providing a bioavailable form that the body can easily absorb and utilize.

While beans, fish, and citrus fruits have their own nutritional benefits, they do not provide as high a level of vitamin B2 as milk does. Beans are primarily known for their protein and fiber content, fish is more associated with omega-3 fatty acids, and citrus fruits are predominantly high in vitamin C. Hence, milk stands out as the best source of vitamin B2 among the options provided.