**Core Concept**
Pierre Robin Sequence is a congenital condition characterized by a triad of micrognathia, glossoptosis, and upper airway obstruction. It is a result of abnormal development of the mandible and tongue during embryogenesis.

**Why the Correct Answer is Right**
The correct answer is related to the characteristic findings of Pierre Robin Sequence. Micrognathia refers to the underdevelopment of the mandible, leading to an abnormal facial structure. Glossoptosis, or the posterior displacement of the tongue, further exacerbates upper airway obstruction. The combination of these two factors results in the characteristic features of Pierre Robin Sequence.

**Why Each Wrong Option is Incorrect**
**Option A:** Cleft palate is not a defining characteristic of Pierre Robin Sequence, although it can occur concurrently. However, cleft palate is more commonly associated with other syndromes such as Velocardiofacial syndrome.
**Option B:** Tracheoesophageal fistula is not a feature of Pierre Robin Sequence. It is a congenital anomaly of the esophagus and trachea that can occur independently.
**Option C:** Polydactyly is not a characteristic of Pierre Robin Sequence. It is a congenital anomaly of the hands or feet that can occur in various syndromes.

**Clinical Pearl / High-Yield Fact**
Pierre Robin Sequence can be associated with other congenital anomalies, such as cardiac defects, and may require surgical intervention to correct upper airway obstruction. It is essential to recognize the characteristic features of Pierre Robin Sequence to provide appropriate management and care.

**Correct Answer:** D. Glossoptosis.