An investor is developing a portfolio of stocks. She has identified 3 stocks in which to invest. She wants to earn at least 5% return but with minimum risk. 
What is the objective function for the NLP formulation of this problem?
Definitions:
Iodine
A chemical element essential for the production of thyroid hormones, which regulate metabolism and are crucial for growth and development.
Thyroxine
A major hormone produced by the thyroid gland, important for regulation of metabolism, energy generation, and growth and development.
Iron
A chemical element with symbol Fe, essential for blood production in the human body.
Hemoglobin
An iron-containing protein in red blood cells that is responsible for transporting oxygen from the lungs to the body's tissues.
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