A sugar ' $X$ ' dehydrates very slowly under acidic condition to give furfural which on further reaction with resorcinol gives the coloured product after sometime. Sugar ' $X$ ' is
  • A
    Aldopentose
  • B
    Aldotetrose
  • C
    Oxalic\,acid
  • D
    Ketotetrose
JEE MAIN 2022, Medium
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