Which symptom is associated with a glucagonoma?

A glucagonoma is a rare type of pancreatic tumor that secretes excess glucagon, a hormone that increases blood glucose levels by promoting gluconeogenesis and glycogenolysis in the liver. One of the hallmark symptoms of glucagonoma is indeed chronic diarrhea. This diarrhea is often characterized as watery and can lead to fluid and electrolyte imbalances.

The increased levels of glucagon can also result in diabetes or hyperglycemia, but chronic diarrhea is a more direct and specific symptom associated with this type of tumor. Patients suffering from glucagonoma may also experience weight loss and a necrolytic migratory erythema rash, which are frequently linked to the syndrome caused by the tumor's hormonal excess.

The other options, while they relate to effects of glucagon, do not capture the defining symptoms of glucagonoma in the same way chronic diarrhea does.