Dr. johnson is lecturing to a group of medical students. her lecture focuses on the period beginning around 10 years before menopause when hormone production begins to change. she is discussing

perimenopause

Explanation:

According to my research and based on the description of what Dr. Johnson is talking about we can say she is discussing perimenopause. Perimenopause is the clinical term to describe the period of a woman's life before the woman starts going through menopause. Therefore it safe to say that she is discussing this with clinical term with the group of medical students.

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