system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
All are true regarding aoic arch derivatives except:
assistant
The correct answer is  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