What type of immunity does a person gain when they receive an infusion of antibodies for short-term protection?

Choice A reason: Cell-mediated immunity, part of adaptive immunity, targets specific pathogens after exposure, not species-specific barriers. It is not the primary defense against cross-species transmission, making this choice incorrect for species-specific immunity.

Choice B reason: Natural immunity is a vague term, often meaning innate or acquired immunity. It is not specifically species-specific, as innate immunity provides the primary barrier to zoonotic diseases, making this choice incorrect.

Choice C reason: Acquired immunity develops after exposure or vaccination, targeting specific pathogens. It is not species-specific and does not primarily prevent animal-to-human disease spread, making this choice incorrect.

Choice D reason: Innate immunity, including species-specific barriers like skin and mucosal defenses, prevents pathogen transmission across species. These non-specific mechanisms reduce zoonotic disease risk, making this the correct choice for species-specific immunity.

Choice A reason: Heart failure is a consequence of CAD, not a cause. It results from impaired cardiac function, often due to ischemia from CAD, but does not directly contribute to coronary artery plaque formation, making this incorrect.

Choice B reason: Pneumonia affects the lungs, causing infection and inflammation, not coronary arteries. It may increase cardiac demand, but it does not cause atherosclerosis or CAD, making this choice incorrect for CAD development.

Choice C reason: Low blood pressure does not cause CAD; it may result from cardiac issues. CAD is driven by atherosclerosis from risk factors like diabetes, not hypotension, making this choice incorrect for causing CAD.

Choice D reason: Diabetes causes CAD by promoting atherosclerosis through hyperglycemia, which damages endothelial cells, increases inflammation, and accelerates plaque formation in coronary arteries. This is a major risk factor, making this the correct choice.