**Question:** The free gingival graft is placed on:

A. Buccal mucosa
B. Palatal mucosa
C. Alveolar mucosa
D. Gingival margin

**Core Concept:** Free gingival graft is a surgical procedure in periodontics, where a piece of gingival tissue is harvested from one site and transplanted to another site. This technique is used to improve the width and coverage of the gingiva, particularly for treating gum recession and esthetics.

**Why the Correct Answer is Right:** The correct answer is B. Palatal mucosa because the palatal mucosa has a thin and transparent epithelium, which allows for better integration and adaptation of the grafted tissue. The palatal mucosa also has a relatively low risk of causing donor site morbidity, making it an excellent choice for the graft donor site.

**Why Each Wrong Option is Incorrect:**

A. Buccal mucosa: Buccal mucosa is thicker and has a higher risk of morbidity due to its attachment to the underlying bone. This makes it a less suitable option compared to palatal mucosa.

C. Alveolar mucosa: Alveolar mucosa is a thick and tough tissue that can lead to poor adaptation and integration of the grafted tissue. In addition, it may cause donor site morbidity due to its attachment to the underlying bone.

D. Gingival margin: The gingival margin refers to the junction between the gingiva and the tooth, which is not a suitable graft donor site as it may lead to poor adaptation and integration of the grafted tissue.

**Clinical Pearl:** When selecting a graft donor site, consider factors such as tissue thickness, transparency, morbidity risk, and ease of adaptation. Palatal mucosa offers a superior option due to its thin and transparent epithelium, low morbidity risk, and good adaptation.