This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
Thoracic sympathetic nerve trunk lies 
Select and explain. 
A. In front of body of veebra, B. Infront of head of ribs, C. Anterior to the costal pleura, D. Behind the sternum
B: Infront of head of ribs
Answer: B: Infront of head of ribs 
Explanation: The chain crosses the head of second to tenth rib BD CHAURASIA&;S HUMAN ANATOMY UPPER LIMB THORAX SIXTH EDITION VOL 1PAGE NO 224