Choose your answer from: [I] Hormone surgery usually is performed to predispose the hair to disease, and women as well as men. Men or women have a correlation between these hormonal defenses resulting from hair thinning and hair thickness.; [II] Women with male unwanted hair thinning usually feel a sense of attraction to men or people with men. This mutual attraction is likely another reason men may produce hair longer.; [III] Most causes of thinning hair are gene mutations or inherited genes. The myth that men and women aren't genetically related and that they have unexplained thinning hair is not realistic.; [IV] Sometimes hormonal fluctuations lead to impermanent hair loss. Women who are pregnant, have discontinued birth control, or are going through menopause may experience temporary hair thinning.;Choose from options above and answer: What most naturally follows?

How to treat thinning hair 
See if hormonal causes are at play. 
The most common cause of thinning hair for both men and women is a hereditary condition in which sex hormones cause hair to fall out in a particular pattern. While male or female pattern baldness is permanent, there are certainly measures you can take to slow it down and treat it.
Answer:
[IV]