Final answer:
The World Health Organization lists cardiovascular disease as the world's leading killer of adults, surpassing other infectious diseases such as malaria, HIV/AIDS, and tuberculosis.
Step-by-step explanation:
The World Health Organization (WHO) lists cardiovascular disease as the world's leading killer of adults. Cardiovascular diseases, which include heart disease, stroke, and hypertension-related conditions, are the top cause of death globally, surpassing infectious diseases like malaria, HIV/AIDS, and tuberculosis.
While malaria continues to be a severe health problem that causes significant mortality, especially in tropical and subtropical regions, it is not the leading cause of adult deaths worldwide. Similarly, HIV/AIDS has a profound impact on global health, with millions of infections and deaths, particularly in low- and middle-income countries, but it is still not the leading killer of adults globally. Tuberculosis (TB) remains a leading cause of death from infectious diseases, especially in developing countries, but it ranks below cardiovascular diseases in terms of global adult mortality.
Therefore, the correct answer to the question is B. Cardiovascular disease.