( ) From the orthographical point of view, a compound can be written as one word with or without a hyphen in between, or as two separate words, the choice of which is determined by conventions.

非孪生兄弟姐妹间进行器官移植引起排斥反应是

A．异种抗原

B．自身抗原

C．同种异体抗原

D．嗜异抗原

E．手术时细菌感染