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: Pediatrics
A baby is born at 27 weeks of gestation required mechanical ventilation for next 4 weeks & 02 for next 1 week. He maintained at room temperature subsequently. As per new Bronchopulmonary dysplasia definition, he has which of the following ? 
Select and explain. 
A. Mild BPD, B. Moderate BPD, C. Severe BPD, D. No BPD
C: Severe BPD
Answer: C: Severe BPD 
Explanation: Ans. is 'c' i.e., Severe BPD