This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
The right coronary aery arises from ? 
Select and explain. 
A. anterior aoic sinus, B. left posterior aoic sinus, C. right posterior aoic sinus, D. inter aoic sinus
A: anterior aoic sinus
Answer: A: anterior aoic sinus 
Explanation: Right coronary aery is smaller than the left coronary aery. It arises from the anterior aoic sinus. Left coronary aery is larger than the right coronary aery. It arises from the left posterior aoic sinus. REF : B D Chaurasia's Human Anatomy , seventh edition , volume 2 , pg.no., 278, 279. FIG REF : B D Chaurasia's Human Anatomy , seventh edition , volume 2 , pg.no., 278, 279. ( fig 18.22a and b ).