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
Which of the following type of PRR requires local anesthesia and liner? 
Select and explain. 
A. Type A, B. Type B, C. Type C, D. All of the above
C: Type C
Answer: C: Type C 
Explanation: TYPES OF PRR
Based on the extent and depth of the carious lesions:
a) Type A - Suspicious pits and fissures where caries removal is limited to enamel.
b) Type B - Incipient lesion in dentin that is small and confined.
c) Type C - Characterized by the need for greater expIoratory preparation in dentin.
Key concept
Type C

Greater exploratory preparation of dentin. 
Requires LA.
Requires placement of a liner like calcium hydroxide or GIC over the exposed dentin.