Final answer:
Appendicitis is the most common cause of abdominal pain in children.
Step-by-step explanation:
The most common cause of abdominal pain in children is appendicitis. Appendicitis is the inflammation of the appendix, a small organ located in the lower right abdomen. It commonly occurs in children and young adults and requires surgical removal of the appendix. Other causes mentioned in the options include aortic aneurysm, which is extremely rare in children, gallbladder disease, which is more common in adults, and infection of the pancreas, which is also less common in children.
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