The dissolution rate of a solid drug is governed by?

The dissolution rate of a solid drug is governed by?
A. Henderson-Hasselbalch equation
B. Noyes-Whitney equation
C. Michaelis-Menten equation
D. Henderson equation

Which of the following is an example of a prodrug?
A. Morphine
B. Enalapril
C. Digoxin
D. Furosemide