a 70 year old patient is brought to the emergency room because he has icterus, pale stools, choluria pruritus, anorexia, asthenia and weight loss. The patient also occassionally has epigastric pain. On the physical exam, it was found a firm, hard, painless epigastric mass. What is the most likely diagnosis in this case? a. obstructive icterus due to lithiasis in the main bile duct b. obstructive icterus due to pancreatic cancer c. hepatic icterus due to cirrhosis of the liver d. chronic pancreatitis
