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
The causative organism in Madura Mycosis Mycetoma is - 
Select and explain. 
A. Nocardia, B. Dimorphic fungus, C. Aspergillus, D. Dermatophytes
A: Nocardia
Answer: A: Nocardia 
Explanation: None