This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
A 52 year old alcoholic male develops chronic severe upper abdominal pain and maldigestion. Ultrasound studies demonstrate pancreatic calcifications. Which of the following disorders will this patient most likely develop? 
Select and explain. 
A. Diabetes mellitus, B. Hypehyroidism, C. Hypothyroidism, D. Pheochromocytoma
A: Diabetes mellitus
Answer: A: Diabetes mellitus 
Explanation: Pancreatic calcifications constitute strong radiologic evidence of chronic pancreatitis. Up to 30% of patients with chronic pancreatitis eventually develop secondary diabetes mellitus as a consequence of destruction of islets in addition to pancreatic ducts. This form of diabetes mellitus may also eventually cause small vessel damage and blindness. Neither hypehyroidism nor hypothyroidism are related to chronic pancreatitis. Pheochromocytoma is unrelated to chronic pancreatitis. Ref: Fisher W.E., Anderson D.K., Bell R.H., Saluja A.K., Brunicardi F.C. (2010). Chapter 33. Pancreas. In F.C. Brunicardi, D.K. Andersen, T.R. Billiar, D.L. Dunn, J.G. Hunter, J.B. Matthews, R.E. Pollock (Eds), Schwaz's Principles of Surgery, 9e.