The correct answer is B. Coronary artery disease is the most prevalent disease in this age group. Cancer is also prevalent in this age group with lung, prostate, and colon cancer being the most common. Keep in mind the difference between prevalence and incidence when answering this sort of question. Prevalence is the percent of a given population effected at any given time. Incidence is the number of new cases arising for a period of time.
Accidental trauma (choice A) is the leading cause of death in the under 30 age group.
HIV (choice D) is prevalent in younger populations particularly in groups that have multiple sexual partners and use intravenous drugs.
Head-and-neck cancer (choice C) is one of the most common causes of cancer-related death, but would be less common than coronary artery disease in this age group.
Osteogenic sarcoma (choice E) occurs in the second to fifth decades of life in long tubular bones and would be relatively rare in this population.
Suicide (choice F) is second only to accidental trauma as the cause of death in the under 30 age group.
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