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
[{'content': 'Lichen planus might be associated with \nSelect and explain. \nA. HAV, B. HBV, C. HCV, D. HDV', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]