Which of these countries does not share a border with Pakistan?
Correct answer: Iraq

Republic of China
The China–Pakistan border is 596 kilometres (370 mi) and runs west–east from the tripoint with Afghanistan to the disputed tripoint with India in the vicinity of the Siachen Glacier. It traverses the Karakorum Mountains, one of the world's tallest mountain ranges.
PoK (Pakistani-occupied Kashmir) is where the borders with China are.