This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Pierre Robbin syndrome is - 
Select and explain. 
A. Cleft palate with syndactly, B. Cleft palate with mandibular hypoplasia and respiratory obstruction, C. Cleft lip with mandibular hypoplasia, D. Cleft lip
B: Cleft palate with mandibular hypoplasia and respiratory obstruction
Answer: B: Cleft palate with mandibular hypoplasia and respiratory obstruction 
Explanation: Pierre Robbin syndrome comprises

isolated cleft palate
retrognathia (posteriorly displaced mandible)
glossoptosis (posteriorly displaced tongue)
early respiratory & feeding difficulties