This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
[{'content': 'The composition of Lugol&;s iodine \nSelect and explain. \nA. 10% KI with 5% Iodine, B. 5% KI and 15% Iodine, C. 5% Iodine with 20% KI, D. 10% Iodine and 20% KI', 'role': 'user'}, {'content': "Answer: A \nExplanation: Lugol's iodine is 10% KI with 5% Iodine. Used as an adjuvent in Graves patients planned for surgery. Iodides decrease the vascularity of the gland anf inhibit the release of thyroid hormones hence called thyroid constipating agents. Ref: KDT 7th ed Pg 255", 'role': 'assistant'}]