What is "ascorbic acid"?

[Nessie]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #315 "Health and Nutrition Questions Test (1)", question 5

......... is found in orange juice and is another word for Vitamin C.

(a) Carbohydrates
(b) Ascorbic acid
(c) Bacteria

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #315 "Health and Nutrition Questions Test (1)", answer 5

Ascorbic acid is found in orange juice and is another word for Vitamin C.

Correct answer: (b) Ascorbic acid

Your answer was: ?
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What is "ascorbic acid"?

Thanks
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... something we never have again, I know... I guess I really really know..

Sorry seems to be the hardest word...

[Mister Micawber]

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another word for Vitamin C.
.
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Native English teacher at Mister Micawber's