This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lichen planus and Other papulosquamous disorders, Subject name: Dental
A patient presented with scarring alopecia, thinned nails, hyperpigmented macular lesions over the trunk and oral mucosa. Diagnosis is: 
Select and explain. 
A. Psoriasis, B. Leprosy, C. Lichen planus, D. Pemphigus
C: Lichen planus
Answer: C: Lichen planus 
Explanation: Scarring alopecia is found in LP and Leprosy both. But oral mucosal involvement and thinning of nails or the diagnosis of LP.