J's answer to Germaine's Junior College 2 H3 Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
J
J's answer
1022 answers (A Helpful Person)
1st
α-D-mannose matches the second structure on the right.
β-D-mannose matches the 4th option
β-D-lyxose matches the third structure on the right.