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: Dental
New born infants are 
Select and explain. 
A. Obligatory oral breathers, B. Obligatory nasal breathers, C. Predominantly oral breathers, D. Nasal and oral breathers
B: Obligatory nasal breathers
Answer: B: Obligatory nasal breathers 
Explanation: None