有关特醛症的叙述，正确的是（）

A.病因可能与对血管紧张素Ⅱ的敏感性增强有关

B.为原醛症中最常见的类型

C.以上都不对

D.少数患者有双侧肾上腺结节样增生，患者对兴奋肾素；血管紧张素系统的试验及抑制试验均无反应

E.血管紧张素转换酶抑制剂可使患者醛固酮分泌减少，高血压、低血钾改善

The most popular organic gem is the pearl. A pearl is the response of a marine mollusk to the presence of an irritating impurity accidentally introduced into its body; a cultured pearl is the result of the intentional insertion of a mother-of-pearl bead into a live mollusk. Whether introduced accidentally or intentionally, the pearl-making process is the same: the mollusk coats the irritant with a substance called nacre. Nacre is composed chiefly of calcium carbonate. Because very few natural pearls are now on the market, most pearls used in fine jewelry are cultured. These include "Biwa" pearls and most other freshwater pearls. Cultured pearls are not easily distinguished from natural pearls except by an expert.

Which of the following people could tell the difference between a cultured pearl and an organic pearl

A．Scuba diver.

B．Fisherman.

C．Jeweler.

D．Clerk.