Which source contains the highest amount of iodine?

Which source contains the highest amount of iodine?

کون سا ذریعہ آئوڈین کی سب سے زیادہ مقدار پر مشتمل ہے؟
Explanation

Seaweed is one of the best sources of iodine, and kelp is the most common type of seaweed harvested for food