While Barack Obama was delivering his final speech to the nation, one nagging question was obsessing Twitter. And for once, it did not involve Donald Trump.

Instead, social media was agonising over the very visible and unexplained absence of the president’s youngest daughter Sasha Obama. There was the president, on stage. There were Michelle Obama and Malia Obama side by side in the audience. But where was Sasha? Where WAS she?

For what felt like a long time, nobody knew, but speculation was rife.

But for real, where is Sasha Obama? pic.twitter.com/NmxOXkBBqp — Tammi LaTela (@TLaTela) January 11, 2017

When the ticket is so 🔥 you can only get 2 for the fam... #sorrysasha #seniority #sashaobama #obamafarewell — Marisol Dorantes (@dorantesmarisol) January 11, 2017

Anyone else wondering if #sashaobama is the designated survivor? — Jaime Allentuck (@JAllentuck) January 11, 2017

Y'all were asking where Sasha was. Hopefully she is at home planning her generation's revolution that will not be televised. #SashaObama — Michelle GG (@maker584) January 11, 2017

When the White House confirmed to CBS that Sasha missed her father’s goodbye speech to the nation because she has an exam in the morning, it all suddenly made perfect sense.

Sasha Obama missed her fathers farewell speech for an exam. She single handedly undermined any excuse I could ever give for missing a class. — Izaha Akins (@izahaakins) January 11, 2017

If Sasha Obama really missed this because of an exam in the morning, there are no more excuses for anything, ever. — Viral Patel (@viralmpatel19) January 11, 2017

Told ya! School gotta come first for #Sasha! https://t.co/MsY1HgDxrj — Ryan Wood (@RyanWoodDFW) January 11, 2017