<prompt> There is an outbreak of watery diarrhea due to Shigella occurred in several day care centers in Pondicherry. Which Shigella sp. is most likely involved?S. boydiiS. flexneriS. sonneiS. dysenteriae  <response>: S. flexneri- most common in India- Shigella sonnei is the most common in developed countries and generally causes a watery diarrhea.- Shigella dysenteriae causes dysentery characterized by tenesmus and the production of scanty, bloody stools. 