Final answer:
A disease that can be spread from person to person is known as b) a communicable disease. Communicable diseases are caused by various pathogens, including bacteria, viruses, and fungi, and can be transmitted in different ways, such as through the air or by close contact.
Step-by-step explanation:
A disease that can be spread from person to person is known as b) a communicable disease. Communicable diseases, like colds and measles, are capable of being transmitted through either direct contact such as coughing or sneezing, or indirect mechanisms. Various pathogens such as bacteria, viruses, and fungi can cause these diseases. Not all communicable diseases are equally contagious; for instance, measles is highly contagious and can be transmitted through airborne droplets, while gonorrhea requires close intimate contact for transmission.
An infectious disease is caused by pathogens, which can be microorganisms like bacteria, viruses, or fungi, or acellular entities such as viroids and prions. These diseases can be spread in multiple ways, including through the air, sexual contact, or even by touching contaminated surfaces. Whether easily transmitted or not, understanding the nature and transmission of communicable diseases is crucial for prevention and control measures.