Is breast an organ?

Yes: Yes, the breast is the milk-producing organ in mammals.

No: Female, as well as male breasts are predominately composed of adipose tissue, i.e. Fat. In females the tissue is supported by something called "coopers ligaments", which with aging led to the term "coopers droopers." aging tends to lead the well gifted down the road to the effects of gravity. Breasts are not an "organ" but have received historically a great deal of attention.

Yes: Yes breasts are organ functioning to feed offspring by producing milk.

Yes: The breast is a gland, which is an organ.

No: I am going to say breasts are a specialized sweat gland and not an organ. An organ is something we can not survive without. I would argue that we could survive without breast. But the human species could survive without breasts.

Yes: Breast is also an organ .