Select the correct pair.

• A
  Large colorless empty cells in the epidermis of grass leaves $-$ Subsidiary cells
• B
  In dicot leaves,vascular bundles are surrounded by large thick-walled cells $-$ Conjunctive tissue
• C
  Cells of medullary rays that form part of cambial ring $-$ Interfascicular cambium
• D
  Loose parenchyma cells rupturing the epidermis and forming a lens-shaped opening in bark $-$ Spongy parenchyma