单项选择题

Questionn 21-25 are based on the follwing passage:
  Tony Huesman,a heart transplant recipient（接受者）who lived a record 31 years with s single donated organ has died at age 51 of leukemia（白血病）,but his heart still going strong."He had leukemia,"his widow Carol Huesman said,"His heart-believe it or not-held out.His heart never gave up until the end,when it had to."
  Huseman got a heart transplant was performed in South Africa.At his death,Huesman was listed as the world's longest wurvivor of a single transplanted heart both by Stanford and the Richmond,Virginia-based United Networl for Organ Sharing.
  "I'm a living proof of a person who can go through a life-threatening illness,have the operation and return to a productive life."Huesman hold the Dayton Daily News in 2006.
  Huesman worked as marketing director at a sporting-goods.He was found to have serious heart disease while in high school.His heart,attacked by a pneumonia（肺炎）virus,was almost four times its normal size from trying to pump blood with weakened muscles.
  Huesman's sister,Linda Huesman Lamb,also was strciken with the same problem and recived a heart transplant in 1983.The two were the nation's first brother and sister heart transplant recipients.She died in 1991 at age 29.
  Huesman fouded the Huesman heart Foundation in Dayton,which seeks to reduce heart disease by educating children and offers a nursing scholarship in honor of his sister.
 

Tony Huesman died from（）.

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