The correct answer is: B. Red and green
Color blindness is a condition in which people have difficulty distinguishing between certain colors. The most common type of color blindness is red-green color blindness, which affects about 8% of men and 0.5% of women. People with red-green color blindness have difficulty distinguishing between red and green, and may also have difficulty distinguishing between other colors that are close to red and green, such as orange and brown.
There is no cure for color blindness, but there are ways to manage the condition. People with color blindness can learn to adapt to their condition by using other cues, such as brightness or contrast, to distinguish between colors. There are also special glasses and contact lenses that can help people with color blindness see colors more accurately.
The other options are incorrect because people with color blindness can usually distinguish between black and yellow, yellow and white, and green and blue.