This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Beta phage is seen in 
Select and explain. 
A. Bacillus anthracis, B. Corynebacterium diptheriae, C. Clostridium botulinum, D. Peptostreptococcus
B: Corynebacterium diptheriae
Answer: B: Corynebacterium diptheriae 
Explanation: The toxigenicity of the diphtheria bacillus depends on the intracellular presence of corynephages (tox+), which acts as genetic controlling toxin production. Non-toxigenic strains are rendered toxigenic by infecting them with the beta or some other phages This is known as lysogenic or phage conversion. REF:Textbook of microbiology; Ananthanarayan and paniker's; 10th Edition; Pg: 240