What is a kremlin?
a. a walled fortress designed to protect a Russian city
b. a multi-domed cathedral at the heart of a Russian city
c. a palace where the tsar and his family resided
d. a tall bell tower used to call Russian citizens to prayer
A Kremlin is "a. a walled fortress designed to protect a Russian city," although it should be noted that the much more popular version is "the" Kremlin, which is the seat of the Russian government.
