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: Unknown
All of the following clinical findings are seen in Horner’s syndrome, except: 
Select and explain. 
A. Miosis, B. Anhidrosis, C. Heterochromia of iris, D. Apparent exophthalmos
D: Apparent exophthalmos
Answer: D: Apparent exophthalmos 
Explanation: Ref: Harrison’s 18/e p 225
 
The triad of miosis with ipsilateral ptosis and anhidrosis constitutes Horner's syndrome, although anhidrosis is an inconstant feature. Brainstem stroke, carotid dissection, and neoplasm impinging on the sympathetic chain occasionally are identified as the cause of Horner's syndrome, but most cases are idiopathic.