The correct option is B Shigella
Bacillary dysentery' is a type of dysentery and is a sever form of shigellosis. Bacillary dysentery is associated with the species of bacteria from the Enterobacteriaceae family. The term is usually restricted to Shigella infections. Shigellosis is caused by one of the several types of Shigella infections.
Thus, the correct answer is option (B), 'Shigella'.