阅读下面短文，请从短文后所给各题的4个选项(A、B、C、D)中选出一个最佳选项。

     It was my liver that was out of order. I knew it because I had just been reading a book, which also described the various symptoms by which a man could tell when his liver was out of order. I remember going to the British Museum one day to read up the treatment for some minor illness. I got down the book and read all I came to read. Then, I turned the pages aimlessly. Before I had read through ten pages, however, I was sure that my liver was out of order.
     I had walked into that reading room happy, healthy man. I crawled out a decrepit wreck. Then I went straight up to my medical man, an old friend of mine. I said, "I will not take up your time, dear boy, with telling you what the matter with me is. Life is brief, and you might pass away before I had finished. But I will tell you what is not the matter with me. I have not got housemaid's' knee (膝盖囊肿). Everything else, however, I have got.” And told him how came to discover it all. 

     He opened me and looked down at me, and clutched hold of my wrist. And then he hit me over the chest when I wasn't expecting it — a cowardly thing to do, I call it — and immediately afterwards butted me with the side of his head. After that, he sat down and wrote out a prescription ） which took to the nearest chemist's. The man read it, and then handed it back. He said he didn't keep it. I read the prescription（处方）. It ran: 1 pound beefsteak, with I pint bitter beer every 6 hours, three-mile walk every morning, 1 bed at 11 sharp every night, and don't stuff your head with things you don't understand. 

     I followed the directions, with the happy result that my life was preserved, and is still going on.