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
Microscopic examination of a pus sample shows a filamentous organism which is acid fast with 1% sulphuric acid. Which of the following organisms could it be? 
Select and explain. 
A. Actinomyces israeli, B. Nocardia brasiliensis, C. Streptomyces somaliensis, D. Blastomyces dermatitidis
B: Nocardia brasiliensis
Answer: B: Nocardia brasiliensis 
Explanation: None