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
According to the Andreasen's modified classification of traumatic injuries, a fracture involving the enamel, coronal and radicular dentin and cementum with exposure of the pulp is categorized as: 
Select and explain. 
A. Complicated tooth fracture, B. Uncomplicated crown root fracture, C. Complicated crown root fracture, D. Uncomplicated crown fracture
C: Complicated crown root fracture
Answer: C: Complicated crown root fracture 
Explanation: Complicated crown fracture: A fracture involving enamel and dentin, and exposing the pulp.
Uncomplicated crown-root fracture: A fracture involving enamel, coronal and radicular dentin, and cementum, but not exposing pulp.
Complicated crown-root fracture: A fracture involving enamel, coronal and radicular dentin, and cementum with exposure of the pulp.
Root fracture: A fracture involving radicular dentin, cementum and pulp.