Select the best definition of Acute pancreatitis.

A. A chronic inflammatory airway disorder with variable and usually reversible airflow obstruction. B. A chronic systemic autoimmune inflammatory arthritis typically affecting small joints symmetrically. C. Acute pancreatic inflammation commonly presenting with severe epigastric pain and elevated pancreatic enzymes. D. A clinical spectrum caused by acute myocardial ischaemia, including unstable angina and myocardial infarction.