This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
Richest source of iodine - 
Select and explain. 
A. Sea food, B. Milk, C. Meat, D. Butter
A: Sea food
Answer: A: Sea food 
Explanation: The best source of iodine are sea foods and Cod liver oil. Smaller amount may occur in meat, milk, vegetable. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 624