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: Medicine
Facial nerve injury during forceps delivery in labour is due to: 
Select and explain. 
A. Mastoid process is absent at birth, B. Parotid gland in developing stage, C. Beak of forceps engages main trunk of facial Nerve, D. Sublingual hematoma during delivery causes neuropraxia
A: Mastoid process is absent at birth
Answer: A: Mastoid process is absent at birth 
Explanation: None