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: Dental
All of the following drugs can worsen psoriatic lesion, except – 
Select and explain. 
A. Chloroquine, B. Beta-blockers, C. Acitretin, D. Lithium
C: Acitretin
Answer: C: Acitretin 
Explanation: Acitretin is used in the treatment of psoriasis.