下列有关苯妥英钠的叙述，不正确的是

A．治疗某些心律失常有效
B．会引起牙龈增生
C．可用于治疗三叉神经痛
D．治疗癫痫强直阵挛性发作有效
E．口服吸收规则，t_1/2个体差异小

Which of the following statements about the economic rent to a natural resource is most accurate（）

A. The entire payment for a non-renewable natural resource is economic rent. 

B. A non-renewable natural resource earns economic rent only if demand for the resource is perfectly inelastic. 

C. The entire payment for a renewable natural resource is economic rent.