This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
Cailaginous pa of external auditory canal is 
Select and explain. 
A. Medial 1/3, B. Lateral 1/3, C. Medial 2/3, D. Lateral 2/3
B: Lateral 1/3
Answer: B: Lateral 1/3 
Explanation: Lateral 1/3rd of the external auditory canal is cailaginous and medial 2/3rd is bony.Ref: Hazarika; 3rd ed; Pg 9