Which statement best defines the human gut microbiome in the context of modern microbiology?

• A. A population of viruses responsible for infections in the digestive system
• B. The collection of bacteria that temporarily enter the stomach with food
• C. The combined community of microorganisms inhabiting the digestive tract and contributing to host physiology
• D. A group of harmful intestinal microbes that must be eliminated for proper digestion

Answer: (C)