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What is Which of the following type of PRR requires local anesthesia and liner? and explain in detail?
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.