In the anime, Sword Art online (season2) what was Zekken's secret that Kirito found out?

This secret led Zekken in choosing Asuna instead of Kirito into her guild or:This secret led Zekken in choosing Asuna instead of Kirito into her guild

This secret led Zekken in choosing Asuna instead of Kirito into her guild

or:This secret led Zekken in choosing Asuna instead of Kirito into her guild

or:Due to dystocia, a caesarean section had to be performed, but an accident caused a large amount of bleeding and thus a blood transfusion was given. However, the blood was infected with the Human Immunodeficiency Virus (HIV), which causes the Acquired Immune Deficiency Syndrome (AIDS).

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