【名词&注释】
急性阑尾炎(acute appendicitis)、临床表现(clinical manifestation)、急性肠梗阻(acute intestinal obstruction)、化学品(chemicals)、污染物(pollutants)、急性胆囊炎(acute cholecystitis)、急性胃肠炎(acute gastroenteritis)
[单选题]A fire in a pile of dunnage would be classified as a _____.
A. class A
B. class B
C. class C
D. class D