Which glycosidic linkage between galactose and glucose is present in lactose?

• A
  $C-1$ of galactose and $C-4$ of glucose
• B
  $C-1$ of glucose and $C-6$ of galactose
• C
  $C-1$ of glucose and $C-4$ of galactose
• D
  $C-1$ of galactose and $C-6$ of glucose