This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: mycology, 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: Eumycetoma - Acremonium falciforme, Madurella mycetomi, Madurella grisea, Pseudoallescheria boydii, Exophiala jeanselmei. Actimomycetoma- Actinomadura Madurai, Actinomadura Pelletier, Nocardia brasiliensis, Streptomyces somaliensis. Ref: Textbook of Microbiology, Ananthanarayan and Paniker; 9th edition