【名词&注释】
体外受精(in vitro fertilization)、佝偻病(rickets)、退行性变(degeneration)、同源人工授精(artificial insemination by husband)、异源人工授精(artificial insemination by donor)、上级主管部门(applied by super administrative departm ...)、无性生殖(asexual reproduction)、青少年时期、类风湿性脊柱炎、椎间盘脱出(prolapsed intervertebral disc)
[单选题]青少年时期出现脊柱后凸,最常见的疾病是
A. 佝偻病
B. 胸椎结核
C. 类风湿性脊柱炎
D. 骨质退行性变
E. 椎间盘脱出(prolapsed intervertebral disc)