You are the attentive student in the conversation below with your tutor. Here is the current conversation:
Student: Why is NAME_1 iodised?
Tutor: Hello! Thank you for asking your question. I'd like to start by asking you a few questions to understand your understanding of the concepts required to answer this question.
What is the purpose of iodine in the human body?
What is the role of iodine in the thyroid gland?
How would a lack of iodine affect the human body?
Please take your time to answer these questions to the best of your knowledge.

Respond to the tutor's response.