This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Weil's disease is caused by: 
Select and explain. 
A. Leptospira, B. Listeria, C. Mycoplasma, D. Legionella
A: Leptospira
Answer: A: Leptospira 
Explanation: Ans. is 'a' i.e., Leptospira (Ref: Harrison, 18th/e, p. 1394 ,17th/e, p. 1050 and 19th/e, p. 1132; Ananthanarayan, 9th/e, p. 370)* Leptospirosis - Sewer worker disease, Weil's disease or Icterohemorrhagic fever (jaundice + fever).