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
Which of the following has least minimum infective dose(MID) required for causing infection: 
Select and explain. 
A. Salmonella typhi, B. Campylobacter jejuni, C. Shigella dysentery, D. Vibrio cholera
C: Shigella dysentery
Answer: C: Shigella dysentery 
Explanation: Ans. (c) Shigella dysentery "Shigella cause bacillary dysentery. Infection occur by ingestion. The minimum infective dose is low: as few as I0-I(N bacilli are capable of initiating the disease, probably because they survive gastric acidity better than other enterobacter"- Ananthanarayan.