This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Papulosquamous disorders, Subject name: Dental
Lichen planus might be associated with 
Select and explain. 
A. HAV, B. HBV, C. HCV, D. HDV
C: HCV
Answer: C: HCV 
Explanation: Lichen planus may be associated with hepatitis C infection The presence of hepatitis is often completely unknown to the patient, being discovered by chance during diagnostic protocol for lichen planus. Prevalence of chronic hepatitis C in patients with oral lichen planus varies between 0.5-35% as repoed by different authors for different geographical areas. The other associations may be vaccinations, dental amalgum, autoimmune diseases. Ref Harrison 20th edition pg 1211 .Harrison 19e pg: 349