This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiopulmonary Resuscitation And Mechanical Ventilation, Subject name: Anaesthesia
Most commonly involved segment of Lungs in Foreign body aspiration (Supine position) 
Select and explain. 
A. 1, B. 2, C. 3, D. 4
C: 3
Answer: C: 3 
Explanation: 3 (Lobe: Right lower lobe lung)