Doubt regarding Visa Intvw

[munnabhai_555]

Hi,
My parents are having visa interview next week for first time.
For any question asked by Visa Officer(VO), is it advisable to just reply to question asked and show necessary corresponding documents if and only if they are asked for it or should they reply to question and show the documents even if they arent asked for it.

What do you all feel which is better approach.

Thanking you all in advance.
Cheers,
Munna

[kk]

If they ask some question, if some document is going to help prove that point, show that document even if not asked for it.