One mole of glucose reacts with ‘X’ moles of acetic anhydride. Number of chiral centres in glucose hemiacetal is/are ‘Y’. Number of carboxylic acid groups in glucaric acid is/are ‘Z’. Value of  X, Y. Z respectively is  

• A

  5, 4, 2

• B

  5, 5, 2

• C

  5, 4, 1

• D

  5, 5, 1