Koun Banega Karodpati question

 This question was asked on Koun Banega Karodpati program recently and it made me baffled.

Question 

On what surface did Leonardo Di Vinci paint the monalisa  ??

1.  Wood

2.  Paper 

3.  Canvas 

4.  Bronze 

Answer 

Many of us readily tell the answer to above question as canvas  !!!!

Painters often draw their paintings on canvas. 

Leonardo Di Vinci  was a famous painter of his time. 

His acclaimed artwork is monalisa painting. 

But on what surface did he draw the painting ?

No one could have imagined..... 

Even the contestant opted for lifeline, audience poll. 

Studio audience have given 66 % of  votes to canvas.

But answer was wrong  !!!!

Correct answer is   Wood.. 

Host Amitabh Bachchan explained, 

Monalisa painting was drawn in 16th century on wooden surface.