A 50-Year-Old Man Who Is Showing Signs of Acromegaly Is

A 50-year-old man who is showing signs of acromegaly is found to have an elevated concentration of growth hormone and another hormone in blood that was apparently derived from the liver. Which other hormone is most likely increased in this patient's blood?

A) Glucagon
B) Somatostatin
C) Insulin growth factor I
D) Cholecystokinin
E) Secretin