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If you take a color photo of a black and white subject, the photo is still considered a color photo. The fact that the subject is black and white does not change the fact that the photo was taken in color. However, if you were to convert the photo to black and white, it would then be considered a black and white photo.
It's important to note that the term black and white refers to the absence of color, not the presence of the color black. In photography, black and white refers to images that are created using shades of gray, with no color present. When we talk about a black and white photo, we're referring to an image that has been converted to grayscale, where all colors have been removed and replaced with different shades of gray.
So, if you take a color photo of a black and white subject, it's still a color photo because it contains color, even if the subject itself is black and white. If you convert that photo to black and white, it would then be considered a black and white photo.