So...
I was revising extension biology today. Learning to make yoghurt - as you do - because the syllabus is weird.
Anyway, the standard method is sterilise milk, add more proteins, add Lactobacillus and ferment. This turns lactose into lactic acid, causing pH change and coagulation, and so you have yoghurt.
Now, as i was in sainsburys today i saw 'LactoFree' Yoghurt. So i pick it up, and with my mum discover that it contains not lactose (sugar) but lactase (protein). My mum tells me that lactase breaks the lactose down into Glucose and Galactose.
So yoghurt with galactose in it?
Clearly you should extract galactose ferment it with Galactobacillus and turn it into Galactic Acid.
Boom Galactic Acid - Biology Logistics are awesome!