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
Which of the following conditions may cause Anhydrosis of the homolateral side of the face: 
Select and explain. 
A. Cervical sympathetic paralysis, B. Facial nerve trauma, C. Trigeminal nerve trauma, D. Cerebral embolus
A: Cervical sympathetic paralysis
Answer: A: Cervical sympathetic paralysis 
Explanation: None