Which of the following is listed as a cause of hair loss?

• A. Genetics, illness, medications, hormones, or stress
• B. Hair coloring
• C. Sun exposure
• D. Vitamin C deficiency

Answer: (A)

Hair loss comes from a variety of factors, not just one cause. The best answer lists genetics, illness, medications, hormones, or stress because each of these is a well-documented factor that can disrupt the hair growth cycle and lead to thinning or shedding. Genetics explains why some people have a inherited tendency toward thinning; illnesses and medical conditions can stress the body and push hair into a shedding phase; certain medications can have hair loss as a side effect; hormonal changes can alter follicle activity; and stress can trigger noticeable shedding even in people with no other issues.

Hair coloring can weaken hair or cause breakage and scalp irritation, but it doesn’t typically cause hair loss from the roots in the way the other factors do. Sun exposure mainly affects the skin and hair shaft rather than causing follicles to stop producing hair. Vitamin C deficiency affects overall health but isn’t listed as a direct, primary cause of hair loss in standard references. So, the combination involving genetics, illness, medications, hormones, or stress best matches the causes of hair loss.