[Answer] Which sea separates Italy and Croatia?

Step 1 : Introduction to the question "Which sea separates Italy and Croatia?"

...1. Adriatic Sea 2. Caspian Sea 3. Ionian Sea 4. Tyrrhenian Sea

[Answer] What separates North and South Korea?

Step 1 : Introduction to the question "What separates North and South Korea?"

...1. The Korean Wall 2. The Strait of Korea 3. Han River 4. Korean Demilitarized Zone