What is the characteristic feature of a cyst capsule formed by Malassez epithelial rests?

Rests of Malassez are epithelial remnants of Hertwig's Epithelial Root Sheath that persist in the PDL. When stimulated (by periapical inflammation), they proliferate to form a RADICULAR (periapical) CYST. The cyst capsule is well-defined and FIBROUS (connective tissue wall) lined with non-keratinizing stratified squamous epithelium. It is NOT lined with enamel (C wrong), NOT impermeable — cysts can accumulate fluid (B wrong), and does NOT contain ameloblasts — those are in enamel-forming organs (D wrong). A is correct.