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: Anaesthesia
In infant (full term) diameter (mm) length (cm) of ETT used are – 
Select and explain. 
A. 3.5,16, B. 7,12, C. 3.5,12, D. 7, 10
C: 3.5,12
Answer: C: 3.5,12 
Explanation: For full term infant, oral tracheal tube should have internal diameter of 3.5 mm and a length of 12 cm.