Structure involved in Addison's disease is
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Adrenal cortex
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Adrenal medulla
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Pituitary
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Thyroid
A
Correct answer
Explanation
Addison's disease is caused by adrenal cortex insufficiency, leading to decreased production of cortisol and aldosterone hormones. The adrenal medulla secretes adrenaline and noradrenaline, while pituitary and thyroid are distinct endocrine glands.