Answer:Hydrophobic ; inside
Step-by-step explanation:
Lipid bilayer are the the covering of the cells which separates the cell which separates the interior of the cell to the exterior of the cell.
The phospholipid are arranged in double layer with phosphate heads which is hydrophillic in nature and lipid as tail which is hydrophobic in nature.
Tail lies in the inner side and the head lies on the outer side.