A 49-year-old man has been stabbed in the lower right chest. Police on scene report that the patient got into an argument with an unidentified man, who then stabbed him before fleeing the scene. After assessing the patient, you are suspicious that the knife punctured the lung and is causing internal bleeding. In this situation, the mechanism of injury would be:

A) blunt trauma to the lungs.
B) assailant with a knife.
C) internal hemorrhage.
D) stab wound to the right chest.

Answer: D