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
Injury to cervical sympathetic trunk produces Horner's syndrome, that includes all, except 
Select and explain. 
A. Anhydrosis, B. Enopthalmos, C. Ptosis, D. Mydriasis
D: Mydriasis
Answer: D: Mydriasis 
Explanation: Injury to cervical Symphathetic trunk (which are formed by T1 to T4 fibres of spinal cord) produces Horner's syndrome. It is characterized by
• ptosis (dropping of the upper eyelid)
• miosis (constriction of pupil)
• anhydrosis (loss of sweating)
• enophthalmos (retraction of eye ball)