The correct answer is option C, that is, viruses.
An infection occurs when a foreign species moves inside the body of an individual and causes harm. The species utilizes the body of that person to reproduce, sustain itself, and colonize. These infectious species are called pathogens. The examples of pathogens are viruses, bacteria, prions, and fungi.
Of the given options, viruses are the smallest infectious agent. The viruses are basic particles, which must infect a host cell to reproduce and develop. Viruses utilize the host cells metabolic machinery to double themselves.
The macromolecule that is present in albumin would be proteins. Also, it has traces of lipids and carbohydrates. The albumins are a family of globular proteins, the most common of which are the serum albumins. All the proteins of the albumin family are water-soluble.
Carbon monoxide is the most common type of poisoning by gases
