设f(x)的一个原函数是xlnx，则f(x)的导函数是

• A.l+lnx<br/>
• B.<img src="https://timg.fentiku.com/javaimportItems/44851d922c6f4f98b3ddcbd1eb008310/images/71ccf.png"><br/>
• C.<img src="https://timg.fentiku.com/javaimportItems/44851d922c6f4f98b3ddcbd1eb008310/images/7221a.png"><br/>
• D.<img src="https://timg.fentiku.com/javaimportItems/44851d922c6f4f98b3ddcbd1eb008310/images/72783.png"><br/>

正确答案：C