An adult patient presents with chronic low-grade pain associated with tooth no. 9 in which there is a root canal filling. A biopsy of a periapical radiolucency associated with the tooth shows gra-nulation tissue and scar lined by nonkeratinized epithelium. This patient has:

a. Granulomatous infection
b. Periapical granuloma
c. Periapical cyst
d. Periapical cemento-osseous dysplasia
e. Odontogenic keratocyst

C