This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
GV  Black simply classified cavities as: 
Select and explain. 
A. Two classes of smooth surface and three classes of pit and  fissure lesions, B. Three classes of smooth surface and  two  classes of pit  and  fissure lesions, C. One  class  of  pit  and  fissure  and  four  classes  of  smooth  surface lesions, D. None of the above
C: One  class  of  pit  and  fissure  and  four  classes  of  smooth  surface lesions
Answer: C: One  class  of  pit  and  fissure  and  four  classes  of  smooth  surface lesions 
Explanation: None