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
Total body iodine is about - 
Select and explain. 
A. 20 mg, B. 30 mg, C. 40 mg, D. 50 mg
D: 50 mg
Answer: D: 50 mg 
Explanation: The adult human body contain 50mg of iodine. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 624