This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Preauricular sinus is formed due to 
Select and explain. 
A. Improper fusion of auricular tubercles, B. Persistent opening of first bronchial arch, C. Degeneration of auricular tubercles, D. None of the above
A: Improper fusion of auricular tubercles
Answer: A: Improper fusion of auricular tubercles 
Explanation: Preauricular appendages form due to development of accessory hillocks where as preauricular sinus/pits occur due to abnormal development of auricular tubercles/hillocks(six mesodermal thickenings) REFERENCE: TEXTBOOK OF CLINICAL EMBRYOLOGY... VISHRAM SINGH SECOND EDITION..PAGE NO:312