Which of the following is an inflammation of the liver commonly caused by viruses?

Hepatitis is characterized as an inflammation of the liver that is often caused by viral infections. There are several types of hepatitis viruses, including hepatitis A, B, C, D, and E, each of which can lead to inflammation and damage in the liver. This condition can result in a range of symptoms including jaundice, fatigue, abdominal pain, and elevated liver enzymes in the blood, indicating liver inflammation.

Understanding the other conditions listed provides context: Crohn's Disease involves inflammation of the gastrointestinal tract; GERD (Gastroesophageal Reflux Disease) pertains to the esophagus and involves acid reflux; and appendicitis refers to the inflammation of the appendix. None of these conditions directly affect the liver or are primarily caused by viral infections, which is what distinguishes hepatitis as the correct answer.