Anesthesia that affects a single nerve, a deep plexus, or a network of nerves is known as:

A. local infiltration anesthesia
B. field block anesthesia
C. spinal anesthesia
D. subarachnoid anesthesia

b
Rationale: Field block anesthesia affects a single nerve, a deep plexus, or a network of nerves. Field block anesthesia and nerve block are forms of regional anesthesia.

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