Infectious respiratory disease is potentially damaging to the lungs of all

[Dexter L]

species...? However, due to relative lung capacity and specific physiologic response, one of the following species is dramatically affected by this condition. That species is called:
a.porcine,
b.bovine, or
c.equine
need for a vet science review, thanks

[HeatherMagic]

I'd sure guess c) since horses tend to be the most delicate, sensitive, and reactive of the large animals. Also, swine and cattle are rarely asked to physically exert themselves and stress their respiratory systems, so horses would have the disadvantage there too.

Good luck