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
Which of the following is known to be severely pruritic? 
Select and explain. 
A. Lichen planus, B. Psoriasis, C. Icthyosis, D. Secondary syphilis
A: Lichen planus
Answer: A: Lichen planus 
Explanation: Purple polygonal papules marked by severe pruritus; lacy white markings, especially associated with mucous membrane lesions is feature of lichen planus. Psoriasis is variably pruritic. Icthyosis: characterised by severe dryness, fish like scales. There are 5 P in Lichen Planus:Plain, Purple, Polygonal, Pruritic, Papule/ Plague