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: Social & Preventive Medicine
The El Tor biotype of vibrio cholerae was first isolated from: 
Select and explain. 
A. India, B. Egypt, C. Bangladesh, D. Pakistan
B: Egypt
Answer: B: Egypt 
Explanation: The El Tor biotype was first isolated at the El Tor quarantine station in Egypt in 1905. Ref: Park 21st edition, page 207.