Answer : 2. "Small Intestines"
Explanation :

A recent study in Scientific Reports explored the link between migraines and the development of inflammatory bowel disease (IBD). IBD involves chronic inflammation of the digestive tract ranging from mild to severe. These types include ulcerative colitis, which affects the colon and rectum, and Crohn's disease, which is marked by inflammation in the digestive tract, usually the small intestine. Indeterminate colitis IBD combines features of Crohn's disease and ulcerative colitis, leading to potentially life-threatening complications for some individuals.