Which dairy-based beverage is fermented with probiotic bacteria and has origins in the Caucasus region?

Kefir

What do treasure cards indicate in the Forbidden Island cooperative game? Lake Ohrid lies between Albania and which other Balkan country? What popular snack cake typically includes features such as cream filling and a chocolate glaze? What legendary American producer is known for creating the "Wall of Sound"? What was the name of the 19th-century route linking Missouri to Santa Fe?