Original: The largest unequivocally C-type asteroid is 10 Hygiea, although the SMASS classification places the largest asteroid 1 Ceres, here as well, because that scheme lacks a G-type.
Simplified: The biggest unequivocally C-type asteroid is 10 Hygiea, although the SMASS classification places the biggest asteroid 1 Ceres, here as well, because that scheme lacks a G-type.