**Core Concept**
Bronchial carcinoids are a type of neuroendocrine tumor originating from the neuroendocrine cells of the bronchial epithelium. They exhibit varying degrees of differentiation and can secrete hormones, leading to distinct clinical syndromes.

**Why the Correct Answer is Right**
Bronchial carcinoids are typically well-differentiated tumors with a relatively low malignant potential. They can be classified into three main groups based on their mitotic rate and Ki-67 labeling index: typical carcinoids (low-grade), atypical carcinoids (high-grade), and small cell carcinoids (high-grade). The clinical behavior and prognosis of bronchial carcinoids depend on their histological type and grade. **Typical carcinoids** have a low risk of metastasis and are often curable with surgical resection.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because bronchial carcinoids are not typically associated with a high risk of metastasis, unlike other types of lung cancer.

**Option B:** This option is incorrect because while bronchial carcinoids can secrete hormones, they are not a primary cause of hypocalcemia.

**Option C:** This option is incorrect because bronchial carcinoids are not a type of squamous cell carcinoma, which is a different histological subtype of lung cancer.

**Clinical Pearl / High-Yield Fact**
A key feature of bronchial carcinoids is their ability to secrete hormones, leading to distinct clinical syndromes, such as flushing, diarrhea, wheezing, and bronchospasm. The most common hormone produced by bronchial carcinoids is serotonin, which can cause flushing and diarrhea.

**Correct Answer: A. Typical carcinoids have a low risk of metastasis and are often curable with surgical resection.**