What condition is described as foul smelling body odor related to sweat?

Bromhidrosis is the correct answer as it specifically refers to foul-smelling body odor resulting from the bacterial breakdown of sweat. This condition occurs when apocrine glands, which are concentrated in the armpits and groin, produce sweat that can mix with skin bacteria, leading to an unpleasant odor.

The other conditions listed do not directly correlate with foul-smelling body odor. Hyperhidrosis involves excessive sweating, but it does not inherently mean that the sweat is foul-smelling. Dermatitis refers to skin inflammation, which can manifest in various ways but is not associated with odor. Acanthosis nigricans is characterized by dark, velvety patches of skin, often linked to insulin resistance, and does not relate to body odor at all. Understanding these distinctions highlights why bromhidrosis is the only condition among the choices that specifically addresses the issue of body odor related to sweat.