Choose the pair in which the words are differently related from the rest.

Taiwan : Taipei
China : Mongolia
Iran : Teheran
Japan : Tokyo

The correct answer is C. Iran: Tehran.

In the other three pairs, the first word is the name of a country and the second word is the name of the capital city of that country. However, Iran is not a country, but a region in Western Asia. Tehran is the capital of Iran.

Here is a brief explanation of each option:

  • A. Taiwan: Taipei. Taiwan is an island country in East Asia. Taipei is the capital city of Taiwan.
  • B. China: Mongolia. China is a country in East Asia. Mongolia is a landlocked country in East Asia.
  • D. Japan: Tokyo. Japan is an island country in East Asia. Tokyo is the capital city of Japan.