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: Microbiology
A farmer has an ulcer on the leg with indurated margin and multiple sinuses with discharging granules. The likely diagnosis is - 
Select and explain. 
A. Mycetoma, B. Scrofuloderma, C. Lupus vulgaris, D. Actinomycosis
A: Mycetoma
Answer: A: Mycetoma 
Explanation: Mycetoma (Maduramycosis)

Is a localized chronic granulomatous involvement of the subcutaneous and deeper tissues, commonly affecting the foot and less often the hand and other parts.
Presenting as a subcutaneous swelling with multiple discharging sinuses.
Sinuses discharge seropurulent fluid containing granules.
These granules are microcolonies of the etiological agents.
A similar condition called botryomycosis is caused by Staphylococcus aureus.