Final answer:
Meckel's diverticulum is caused by diverticulitis, which is a condition where pouches in the large intestine become infected and inflamed.
Step-by-step explanation:
The nurse will explain that the condition causing Meckel's diverticulum is called diverticulitis. Diverticulitis is a digestive disease in which tiny pouches in the wall of the large intestine become infected and inflamed. It is more common in older people and is thought to be due to a combination of genetic and environmental factors.