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 of the following are features of an injury to the cervical sympathetic trunk EXCEPT: 
Select and explain. 
A. An hydrosis, B. Enophthalmos, C. Mydriasis, D. Ptosis
C: Mydriasis
Answer: C: Mydriasis 
Explanation: None