This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
All are true regarding aoic arch derivatives except: 
Select and explain. 
A. Pulmonary aery develops from 6th arch, B. Maxillary aery derives from 1st arch, C. All 6 arches are not present simultaneously, D. 5th arch is absent in 5% of embryos
D: 5th arch is absent in 5% of embryos
Answer: D: 5th arch is absent in 5% of embryos 
Explanation: D i.e. 5th arch is absent in 5% of embryos - All 6 aoic arches are not present simultaneously. In 50% of embryos 5deg' arch is never formedQ.- There is formation of maxillary aery from 15t archQ; hyoid & stapedial aeries from 2nd arch; common, internal & external carotid from 3rd archQ; arch of aoa & right subclan aery from left & right 4th arch respectivelyQ; and pulmonary aery from 6deg' aoic archyQ