The following is not a feature of Pierre – Robin syndrome –: (A) Hearing defect, (B) Coloboma Iris, (C) Respiratory distress, (D) Mandibular hypoplasia
Answer is B. Pierre Robin syndrome consists of -

Micrognathia
The foreshortened floor of mouth
CHDs
Cleft palate or high arched palate
Mandibular hypoplasia (Micrognathia) 
Respiratory obstruction
Normal size tongue