How do you read 15,847?

A．fifteen thousand, eight hundred and forty-seven

B．fifteen thousands, eight hundreds and forty seven

C．fifteen thousand, eight hundred and forty seven

D．fifteen thousand and eight hundred and forty-seven

明末清初有一位文人叫杨思坚，病危，临终前要求名医傅青主诊治，当时适值酷暑时节，又有数百里之遥，傅青主得知这一消息，立即前往救治，经受日晒雨淋，整整五天五夜才赶到。这个案例说明了我国古代医学家哪方面的传统医德（）。

A.一心赴救

B.精勤不倦

C.不分贵贱

D.科学严谨

E.清廉正直