How are people exposed to Tetrodotoxin?

• A. Consumption of puffer fish
• B. Direct contact with blue-ringed octopus
• C. Ingestion of shellfish
• D. Consumption of puffer fish or direct contact with blue-ringed octopus

Answer: (D)

Tetrodotoxin exposure occurs through two main routes: eating puffer fish, which contains the toxin in several organs and tissues, and direct contact or envenomation by a blue-ringed octopus, which can inject the toxin. Shellfish ingestion is typically linked to other marine toxins, not tetrodotoxin, so the safest, most complete statement includes both eating puffer fish and direct contact with a blue-ringed octopus. That’s why this option is the best choice.