Japanese by Example
Learning through examples in manga

That coffee with それ

ご注文はうさぎですか? » Volume 1 » Page 11

Sampling the second coffee, Cocoa mistakenly identifies the coffee as Kilimanjaro. Chino corrects her.

チノ:
それがブルーマウンテンです」
"That is Blue Mountain."

それ is used because the referenced object (the coffee) is near the listener (Cocoa).