CAPE TOWN - Caster Semenya is making a bold bid for double gold in the women's 800m and 1500m but her only guarantee at the World Athletics Championships in London is further scrutiny of the gender controversy that has dogged her career.

The powerful 26-year-old South African is the runaway favorite in the 800, where she seeks a third world title to add to her Olympic gold from Rio de Janeiro last year, and is taking on the 1500 for the first time at a major international meeting.

All of this, though, will come under a cloud of controversy at the Aug 4-13 championships as many feel high testosterone levels give her an unfair advantage.

Anticipating a storm, Semenya this month granted a rare interview to South Africa's SuperSport TV channel, expressing her frustration at continually having her gender questioned.

"I don't understand when you say I have an advantage because I am a woman," she said. "When I pee, I pee like a woman. I don't understand when you say I'm a man or I have a deep voice. I know I'm a female so there's no question for me.

"I have to find a way to deflect (the questioning of her gender), so instead of allowing it to all be negative, I turn it into a positive. My family's support system is fantastic."

After Semenya won the 2009 world title as a 19-year-old, tests reportedly revealed that she was hyperandrogenous, resulting in her body producing an abnormally high amount of testosterone, which makes her more powerful than her rivals.

An International Association of Athletics Federations (IAAF) rule limiting the amount of naturally occurring functional testosterone for female athletes appeared to have narrowed Semenya's prospects, but the IAAF's hyperandrogenism regulations were suspended for two years in 2015 by the Court of Arbitration for Sport, allowing Semenya to make a comeback.

Her time of 1min, 55.27sec at the Diamond League meet in Monaco this month was the fastest in a women's 800 in almost a decade, and there will be an expectation that she could take down the longest-standing athletics world record set by Czechoslovakia's Jarmila Kratochvilova in 1983(1:53.28).

Semenya has made a late decision to add a tilt at 1500 glory to her London program, setting up an intriguing clash with world-record holder Genzebe Dibaba from Ethiopia.

Semenya has run the distance only once this year, winning the South African student championship in April, but she is the reigning African champion from Durban last year where she set a personal best of 4:01.19.

Reuters