Which is the monetary unit of South Korea ?

 This question was asked on Koun Banega Karodpati program.

Question 

Which of these is the monetary unit of South Korea ???

1.  Gun

2. Bun

3. Son

4. Won

Answer 

By looking at the options, anyone can conclude it is   WON  !!!

Suppose options are not available ,, then ?????

We would try to solve the question thinking that options are not given.

I knew currency of Japan is     YEN.

Currency of China is  YUAN.

But what is the currency of South Korea  ????

I didn't know the answer.

I asked Google.

Google said          SOUTH KOREAN  WON    !!!