I have two exercises which I don't exactly understand. I've already known that
どちら is more polite form from どこ. This two could ask about place and
"what/which one" ."nan" asks about "kind of company", isn't it? I've checked
the answers and it looks like that:

  1. > A: おくには なん／どこ ですか。  
>  B: タイです。

Correct answer here is "doko" and I suppose it's because of the meaning "what
country". Could it be wrong with "nan"?

  2. > A: かいしゃは なん／どこ ですか。  
>  B: パワーでんきです。

Correct answer is "nan" and I don't understand it! Why it couldn't be "doko"?
Please explain me that.
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grammar word-choice
What's the difference between どこ and なん in this exercise?
> "なん" <- "何{なに}" which means "what."
>
> "どこ" means "where."

Thus

> "かいしゃは なん ですか。" means "what/which company are you working for?"

whereas

> "かいしゃは どこ ですか。" means "where is the company you are working for located?"

But I would say

> どちら (の会{かい}社{しゃ}) に お勤{つと}めですか?" to mean "what/which company are you working
> for?"
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Thanks to @choco's research it's clear that the original right answers are
both どこ. Thus if you've been taught as かいしゃはなんですか？ here, something wrong must
have happened between the original text and you.

So,

> _Could it be wrong with "nan"?_

Definitely. なん（なに） is only used when you ask about its quality. What you want
to know by "What is your country?" usually can also be asked by "Where are you
from?", I guess. In this case, the Japanese language always let どこ "where"
represent the questioned. You could naturally say どこの国【くに】, どこの町【まち】,
どこの会社【かいしゃ】 for "what (lit. where) country/town/company".

If you asked 会社【かいしゃ】はなんですか？ I'd take it as "what kind of company" or "what
trade the company belongs to" as best interpretations. If it were
お国【くに】はなんですか？, my answer (if I were forced to make one) would be something
like "a desert country", "a country of freedom", "a constitutional monarchy
country", or whatever.

* * *

**PS**  
As an aside, どちら is also the polite substitute for どれ "which" and どっち "which,
either A or B", as well as どこ.
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The book _Minna no Nihongo_ 1 says that:

_Doko_ (where) is also used to ask for the name of the country, company,
school, organization, etc., that you belong to instead of _nan_ (what).
_Dochira_ is more formal than _doko_.

> A: かいしゃは なん／どこ ですか。  
>  B: パワーでんきです。

They answered by using a name. That means you need to use _doko_.

I think if you use なん the question will be "what type of company is ... ?" or
"what type of country is ... ?" for _[o]kuni_ , but I do not know if this is
accurate.
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