Irritable bowel syndrome is considered a(n) gastrointestinal (gi) disorder because symptoms are caused by changes in how the gi tract works

I believe the options were:

purposeful

remarkable

exceptional

functional

functional

Irritable bowel syndrome is considered a functional gastrointestinal disorder because there is abnormal bowel function. IBS is a group of symptoms and not a disease in itself, which is why it's called a 'syndrome,' and it is considered less serious than IBD.