This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
Bacteriophages are - 
Select and explain. 
A. Bacteria that infects virus, B. Virus that infects bacteria, C. Virus that infects protozoa, D. Bacteria that infects protozoa
B: Virus that infects bacteria
Answer: B: Virus that infects bacteria 
Explanation: Ans. is 'b' i.e., Virus that infects bacteria * Bacteriophages are viruses that infect bacteria.* Phages play an important role in the transmission of genetic information between bacteria by the process of transduction.* The presence of phage genome integrated with bacterial chromosome confer bacteria certain properties by a process known as phage conversion.* Lambda phase is the prototype of bacteriophage.