Olympic boxers reignite debate over inclusion in women's sports

Algerian boxer Imane Khelif advanced to the quarterfinals of the 66-kilogram ( 145.5-pound ) division on Thursday .

Italy 's Angela Carini withdrew after being struck in the face by Khelf.

The IOC considers the boxers eligible for the Paris Olympics and said the IBA decision to disqualify them last year was arbitrary.

Commentators on sports shows and celebrities on social media have referred to Khelfi as a "biological male".

There is little to no evidence that Khelif and Lin have sex differences in sex development.

Caster Semenya won gold in the 800 meters at the 2009 world championships.

Semanya lost a 15-year battle with World Athletics over her eligibility and that of other athletes like her.

In 2015 , Indian sprinter Dutee Chand challenged the testosterone requirements at the Court of Arbitration for Sport .

The IOC has allowed each international sports federation to set its eligibility requirements for the Olympics .

There has been an increasing patchwork of policies governing transgender and intersex athletes at all levels of sports.