单选题：The Story of LaniFive-year-old Lani still takes seven medici

The Story of Lani
Five-year-old Lani still takes seven medicines with her breakfast every morning. “She's very good about it,” says her father David. Lani is alive today because of her father David, in more than one way; when she was one year old she received part of her father's liver in a liver-transplant operation. Lani was born with a liver illness. 46 Doctors advised that trans-plant was the only way in which she would live.
The operation lasted 12 hours and needed two teams, one for the father and one for the daughter.47 In these cases, the donor's liver grows to normal size in about eight weeks and the child's liver becomes smaller.
Lani spent three weeks in hospital after the operation. Because the receiver's body tries to reject the new organ, the patient has to be given special drugs. 48
Although David left hospital after 10 days, he didn't return to work until after three months. In order to reach the liver, the doctors have to cut through the stomach wall, which is strong and full of muscle. It therefore takes a long time to recover after this operation. 49
So far, only 16 of these liver-transplant operations have been carried out in Britain. 50 Doctors say, “If possible, we prefer to take a liver from a dead donor, usually a parent.”
Lani still has to look after her health, and she gets more tired than other children of the same age, but doctors hope that she will continue to get stronger and stronger.
A　She had one operation when she was six weeks old, which was not successful.
B　While these drugs are given, it is important that the patient does not catch any illness, not even a cold.
C　In this operation a piece of liver, weighing about 250--300 grams, was removed from the father and transplanted into the daughter.
D　David quickly recovered from the operation.
E　However, they are more common in North America and Japan.
F　David was finally able to ride his bike again after about a year.
回答第46空。