Which term is an organism that causes disease?

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A disease-causing organism is called a pathogen. Pathogens include bacteria, viruses, fungi, and parasites that can invade the body and disrupt normal functions, leading to illness. This term specifically identifies the cause of disease. Asepsis describes practices and conditions that keep environments free of pathogens—it's about preventing infection rather than naming the organism. Hygiene covers cleanliness and sanitary practices to reduce the spread of microorganisms, not the actual label for disease-causing agents. The remaining option relates to a religion and doesn’t fit scientific terminology. So pathogen is the correct term because it names the agents responsible for disease.