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
M. tuberculosis , virulence factors  are encoded by 
Select and explain. 
A. Kat-G gene, B. rpoV, C. Erp gene, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: → Kat-G gene ⇒ Encodes for oxidase, catalase enzyme.
→ rpoV ⇒ Main sigma factor initiating transcription of several genes.
→ Erp gene ⇒ Encodes for protein required for multiplication.
→ Strains of Beijing / W genotype family.