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: Skin
A 36 years old factory worker developed itchy annular scaly plaques in both groins. Application of a caicosteroid 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: D ie Tinea cruris