One Type of Illegal Doping in Sports Is the Abuse

One type of illegal doping in sports is the abuse of anabolic steroids such as testosterone.Doctors measure the testosterone (T) to LH ratio in athletes' urine to detect such doping.Why is this an effective indicator?

A) Testosterone upregulates LH,so the doping athlete will have an unusually low T/LH ratio.
B) LH downregulates testosterone,so the doping athlete will have an unusually low T/LH ratio.
C) LH has negative feedback onto testosterone,so the doping athlete will have an unusually high T/LH ratio.
D) Testosterone has negative feedback onto LH production,so the doping athlete will have an unusually high T/LH ratio.