William Campbell, Satoshi Omura and Tu Youyou jointly won the 2015 Nobel Prize for medicine for their work against parasitic diseases. Irish-born Campbell and Japanese Omura won half of the prize for discovering a new drug that has helped the battle against river blindness(盘尾丝虫病) and lymphatic filariasis（淋巴丝虫病）. The Chinese scientist Tu Youyou was awarded the other half of the prize for discovering a drug that has reduced the mortality rates for patients suffering from malaria. 

"These two discoveries have provided humankind with powerful new means to these diseases that affect hundreds of millions of people every year," Sweden's Karolinska Institute(瑞典卡洛琳斯卡学院) said in a statement in awarding the prize of 8 million Swedish crowns ($960,000)." "The consequences in terms of improved human health and reduced suffering are immeasurable. "Despite rapid progress in controlling malaria in the past decade, the disease still kills more than half a million people a year, most of them are babies and young children in the poorest parts of Africa.

Medicine is the first of the Nobel prizes awarded each year. Prizes for those in science, literature and peace were first awarded in 1901 in the will of dynamite(炸药) inventor and businessman Alfred Nobel.

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1. The underlined word “crown” means_____in Chinese.（词义猜测）

A    王冠

B    乌鸦

C    美元

D    克朗（瑞典货币单位）