True about Ameloblastoma -a) Cystic lesionb) Rapidly growingc) Malignant diseased) MC site is Tibiae) Presented in children

**Core Concept**
Ameloblastoma is a rare, benign, but locally aggressive odontogenic tumor that arises from the epithelial remnants of the tooth germ. It is the most common primary malignant tumor of the mandible.

**Why the Correct Answer is Right**
Ameloblastoma typically presents as a slow-growing, painless, and expansile cystic lesion in the jaw, often in the mandible. The tumor's growth can be aggressive, leading to bone destruction, but it is not rapidly growing. Ameloblastoma is indeed a benign tumor, but it can have malignant transformation. The most common site for ameloblastoma is the mandible, particularly the posterior mandible, which makes option D correct.

**Why Each Wrong Option is Incorrect**
**Option A:** While ameloblastoma can present as a cystic lesion, this is not a definitive characteristic, and other odontogenic cysts can also present similarly. However, the cystic nature of ameloblastoma is a key feature.
**Option B:** Ameloblastoma is not rapidly growing; it is a slow-growing tumor.
**Option C:** Ameloblastoma is generally considered benign, although it can have malignant transformation in some cases.
**Option E:** Ameloblastoma typically presents in adults, not children.

**Clinical Pearl / High-Yield Fact**
Ameloblastoma is a classic example of a "benign but locally aggressive" tumor, which can lead to significant bone destruction and morbidity if not properly managed.

**Correct Answer: D. MC site is Mandible**