A client is hospitalized for pneumonia and started on intravenous ceftriaxone. After several days of antibiotic therapy, the healthcare team also initiates probiotics as part of the client's treatment plan. The nurse knows that probiotics are indicated for which of the following reasons.

A. To prevent inflammatory bowel disease.: Probiotics may help maintain gut health but are not used as a treatment or preventive measure for inflammatory bowel diseases such as Crohn’s disease or ulcerative colitis. Their effect in IBD is supportive rather than preventive. B. To prevent antibiotic induced constipation.: Antibiotics typically cause diarrhea, not constipation, by disrupting normal intestinal flora. Probiotics restore beneficial bacteria in the gut, so their use is aimed at preventing diarrhea rather than managing constipation. C. To prevent antibiotic associated diarrhea.: Probiotics help replenish healthy gut microorganisms that antibiotics often destroy, maintaining intestinal balance and preventing diarrhea. This reduces the risk of Clostridioides difficile infection and improves overall gastrointestinal tolerance to antibiotic therapy. D. To provide secondary antibiotic coverage of the patient's pneumonia.: Probiotics are not antibiotics and have no antimicrobial activity against pathogens causing pneumonia. Their purpose is to support gastrointestinal health, not to serve as adjunct antimicrobial therapy.