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The correct answer is option 3, the pituitary gland. The pituitary gland, also known as the master gland, is responsible for secreting various hormones that regulate different bodily functions, including the secretion of sex hormones. Sex hormones, such as estrogen and testosterone, are crucial for the development and functioning of the reproductive system. The pituitary gland releases luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which stimulate the production of sex hormones in the ovaries and testes. These sex hormones are essential for the development of secondary sexual characteristics, reproductive processes, and overall sexual function. Therefore, the pituitary gland plays a vital role in the secretion of sex hormones.