This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardio thoracic surgery  , Subject name: Surgery
In erect posture commonest siteof foreign body in bronchus 
Select and explain. 
A. Right lower lobe, B. Right upper lobe, C. Carina, D. Left lower lobe
A: Right lower lobe
Answer: A: Right lower lobe 
Explanation: Foreign bodies like pins,coins entering the trachea pass into the right bronchus,which is wider,more veical & is in line with trachea.Most of the human beings want to take the path of least resistance,so the foreign bodies in the trachea travel down into right bronchus and then into posterior basal segments of the lower lobe of the lung. Reference:B D Chaurasia's Human anatomy-Volume 1,5th edition,page no:288