Pick out the wrong statement:

A. Reboiler is not used in open steam distillation

B. The separation of solutes of different molecular sizes in a liquid solution by use of a suitable membrane is called dialysis

C. Freeze drying is used for the drying of fish

D. Fenske-Underwood equation is used for calculating theoretical number of plates in a distillation column at normal operating reflux condition

Answer: Option D