Lyposomes are used as carriers for drugs and macromolecules in pharmaceutical formulations. They are

A. Phospholipids dispersed gently in aqueous medium to obtain multilamellar vesicles

B. Hydrophilic or lipophilic polymer matrix with a drug reservoir

C. A shallow compartment moulded from a drug impermeable system and rate controlling polymeric membrane

D. Microporous membrane made from ethylene / vinyl acetate polymer

Answer: Option D