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
[{'content': 'A washerman presents with thickness erosion & discolouration of web spaces of toes diagnosis is: \nSelect and explain. \nA. Psoriasis, B. Tinea Unguum, C. Both, D. Candidiasis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e Candidiasis', 'role': 'assistant'}]