black-and-white / monochrome
(The two terms refer to the same thing)
Black-and-white/monochrome photographs have been a staple of trusted reportage photography since the inception of the medium.
Thus monochrome photos are eligible to qualify for the TTG label as long as the result meets rinairs for non-misrepresentation, as per P7.
This is true regardless of whether the photograph was originally recorded in black-and-white (the way most reportage photos were made for roughly a century) or converted from color (the way most monochrome photos printed in 21st-century newspapers are created).
Note that tonal values cannot be reversed in any black-and-white/monochrome photo — i.e., darker colors in the scene cannot be portrayed in the photograph with lighter tones than lighter colors in the same scene, and vice-versa.
If tonal values are reversed, the photo will be disqualified by P2 and P7 and cannot qualify for the TTG label no matter how it is explained.