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
Superior thoracic apeure is bounded by following except 
Select and explain. 
A. T1 veebra, B. 1st pair of ribs and their costal cailage, C. Superior border of the manubrium, D. Xiphoid process
D: Xiphoid process
Answer: D: Xiphoid process 
Explanation: Superior thoracic apeure is not bounded by Xiphoid process B D CHOURASIAS HUMAN ANATOMY UPPER LIMB THORAX VOLU, 1 SIXTH EDITION, PAGE NO, 190