Answer:
S. dysenteriae.
Step-by-step explanation:
Shiga toxin is expressed by the genes that are the part of the lamboid prophage genome. The main symptoms of shiga toxin are water diarrhea and abdominal pain.
Shiga toxin is produced by the species S. dysenteriae. Shigella is a gram negative bacteria and has the ability to replicate at the epithelial cells of the host organism.
Thus, the correct answer is option (3).