Difference between "correct" and "right"

[XOR]

Test No. incompl/inter-66 "How to ask the way", question 4

I'm making for the M25 motorway - is this road the most ......... route?

(a) straight
(b) clear
(c) obvious
(d) direct

Test No. incompl/inter-66 "How to ask the way", answer 4

I'm making for the M25 motorway - is this road the most direct route?

Correct answer: (d) direct
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What's the difference between "correct" and "right"?

XOR

[Alan]

They can both mean the same in the sense of correctly answering a grammar question for example: This is the correct/right answer. Correct has a more exact meaning and could refer to accurate calculations. Right can also mean acceptable as in all right.
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English as a Second Language
You can read my ESL story Present Simple

[Rich7]

mind you, that "right" has several meanings though in this case it's used in this sense:

correctly: in conformity with fact or expectation
If you’d answered right you would have won $100.