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
A 36 years old factory worker developed itchy annular scaly plaques in both groins. Application of a corticosteroid ointment led to temporary relief but the plaques continued to extend at the periphery.The most likely diagnosis is – 
Select and explain. 
A. Erythema annulare centrifugam, B. Granuloma annulare, C. Annular lichen planus, D. Tenia cruris
D: Tenia cruris
Answer: D: Tenia cruris 
Explanation: In this question :-


Annular lesion in groins
Scaly
Itching
Extending peripherially


All suggest the diagnosis of dermatophyte infection.
Dermatophyte infection of groin is known as T. cruris.