This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ohopaedics Q Bank, Subject name: Orthopaedics
A patient with swelling foot, pus discharge, multiple sinuses. KOH smear shows filamentous structures. Diagnosis is: 
Select and explain. 
A. Osteomyelitis, B. Madura mycosis, C. Anthrax, D. Actinomycosis
B: Madura mycosis
Answer: B: Madura mycosis 
Explanation: Madura Mycosisis an example of superficial fungal infection. It consists of multiple species. Swelling with multiple discharging sinus Over mandible (or head - neck region) - Actinomycosis On Foot-Madura foot/Madura mycosis.