A 42-year-old man presents with acute abdominal pain. He describes the pain as constant and severe. Upon further questioning, he affirms that the pain radiates to his back. He leans forward in attempt to alleviate the pain. On physical examination, his temperature is 101 F and his pulse is 94. His abdomen is tender, but there is no guarding or rigidity. There is discoloration in the flanks and discoloration around his umbilicus. His lab results are as follows:

TEST RESULTS REFERENCE RANGE
Potassium 4.2 mEq/L 3.5 - 5.0 mEq/L
Calcium 8.1 mg/100 mL 8.7 - 10.5 mg/100 mL
Amylase 378 U/L 25 - 125 U/L
Lipase 630U/L 30 - 210 U/L

The discoloration of the flanks in this patient is indicative of what sign?

A) Grey Turner's sign
B) Cullen's sign
C) Lisker's sign
D) Kehr's sign
E) Blumberg's sign