What are the four major medical threats?

• A. Heat, Cold, Arthropod-borne illness, and Diarrheal disease
• B. Heat, Cold, Sunburn, Dehydration
• C. Heat, Cold, Hypothermia, Heat stroke
• D. Heat, Cold, Nutritional deficiency, Noise exposure

Answer: (A)

The main idea here is identifying broad, high-impact health risks that are commonly encountered across outdoor, travel, and disaster settings. The four major medical threats are heat, cold, arthropod-borne illness, and diarrheal disease. This set covers the big climate- and environment-related risks: heat-related illnesses and cold injuries from temperature extremes; vector-borne infections transmitted by mosquitoes, ticks, and other arthropods; and diarrheal diseases often tied to water and food safety, sanitation, and disrupted infrastructure. These categories are broad and actionable, guiding prevention measures such as hydration and shade, proper clothing and shelter, vector control and bite prevention, and safe water/food practices. The other options mix specific conditions (like sunburn or heat stroke) or less universally prevalent concerns (nutritional deficiencies, noise) that don’t represent the same comprehensive set of threats encountered across varied settings.