Select the option that is related to the third word in the same way as the second word is related to the first word. (The words must be considered as meaningful English words and must NOT be related to each other based on the number of letters/number of consonants/vowels in the word)

Norway: Oslo::Iran:?

Norway is related to Oslo as Oslo is the capital of Norway

Similarly, from given option

​Baghdad is related to Iraq, as Baghdad is the capital of Iraq

Moscow is related to Russa, as Moscow is the capital of Russia

Tehran is related to Iran as Tehran is the capital of Iran

Madrid is related to Spain as Madrid is the capital of Spain

Thus, Option C is the correct answer.