A 16-year-old male is concerned about acne. He first began to notice worsening acne 6 months ago and began using over-the-counter benzoyl peroxide. After 3 months, his primary care provider prescribed tretinoin and oral tetracycline. He states that he has been using both medications for the last 3 months with no improvement in the acne. He has also noticed he is very quick to anger and moody over the last few months and wonders whether that is a side effect of the acne medications. He is a football player for his high school and has been participating in extra practices to "bulk up" in the hopes of achieving a college scholarship. Upon closer inspection, he has gained 30 pounds in the last 3 months but does not appear overweight, rather has increased muscle mass. He states that a friend on the football team has been giving him pills to help his performance. Which of the following is most likely to be identified?
A. Increased serum luteinizing hormone levels
B. Decreased prothrombin time
C. Lowered thyroxine binding globulin (TBG) levels
D. Increased serum HDL cholesterol