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
Lysogenic conversion is seen in 
Select and explain. 
A. Diphtheria, B. Salmonella, C. Staphylococcus, D. E. coli
A: Diphtheria
Answer: A: Diphtheria 
Explanation: The toxigenicity of the diphtheria bacillus depends on the presence of corynephages(tox+) in it which acts as the genetic determinant controlling toxin production. Non-toxigenic strains may be rendered toxigenic by infecting them with the beta or some other phage. This is known as lysogenic or phage conversion. The toxigenicity remains only as long as the bacillus is lysogenic. Reference: Textbook of Microbiology; Anathanarayan and panicker's; 10th edition; Page no: 240