Workhorse of periodontal therapy is:

 # Workhorse of periodontal therapy is:

A. Double papilla flap

B. Apically repositioned flap

C. Coronally displaced flap

D. Laterally repositioned flap

The correct answer is B. Apically repositioned flap.

An apically displaced (positioned) flap (APF) is a full-thickness or partial-thickness mucoperiosteal flap. It has a relatively high degree of predictability and is a "workhorse" of periodontal therapy.