Pigment production by staphylococcus aureus occurs in?

Ans. is 'b' i.e., Bullous impetigo I am not able to understand this question. As most of the isolates of virulent staph aureus produce golden yellow pigment in culture. It is not disease specific. In Bullous impetigo, there may be postinflammatory pigmentation, especially in dark-skinned patients (But this is not due to pigment produced by staph aureus. Pigment is produced in culture). Among the given options a & c are not caused by staph aureus. So, I will go for option b.