This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bronchopulmonary Segments, Embryonic veins, Subject name: Anatomy
Costal cailage of 8th and 9th rib aiculate with each other by which type of joint 
Select and explain. 
A. Synol, B. Fibrous, C. Synchondrosis, D. Symphysis
A: Synol
Answer: A: Synol 
Explanation: All joints in the anterior rib-cage are synol Except: 1st rib to sternum - Synchondrosis. 10th rib - Ligamentous (never synol) Ribs 2-7 : Synol joints Ribs 8-9 : Synol joints b/w each other, aiculate 7th rib attachment synol joint Xiphisternal joint : Synchondrosis Manubriosternal : Symphysis