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
A person returns to Delhi from Bangladesh after 2 days and has diarrhoea. Stool examination shows RBCs in Stool. The likely organism causing is - 
Select and explain. 
A. Enteropathogenic E. Coll, B. Enterotoxigenic E. Coli, C. Salmonella typhi, D. Shigella dysentriae
D: Shigella dysentriae
Answer: D: Shigella dysentriae 
Explanation: None