This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
True about actinomycetes is: 
Select and explain. 
A. Include A. israelii, Nocardia & Streptomyces are a group of organisms characterized as Gram-positive rods, B. Mycetomas can form as a result of traumatic injury, mainly in people working in farms and forests., C. Organisms form filamentous or hyphae-like structures, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Actinomycetes- include A. israelii, Nocardia & Streptomyces: Gram-positive rods commonly found in soil and decaying organic matter or as colonizers of body surfaces. In culture and lesions, these organisms form filamentous or hyphae-like structures. Eumycetoma- has a fungal origin. Mycetomas can form as a result of traumatic injury, mainly people working in farms and forests.