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
True about mycobacterium leprae: 
Select and explain. 
A. Transmitted by droplet infection, B. Phenolic glycolipid (PGL) is virulence factor, C. Generation time 12-13 days, D. All are true
D: All are true
Answer: D: All are true 
Explanation: Ans. is. 'd' i. e., All are true