下列关于奇静脉的描述正确的是（）。

A.注入上腔静脉

B.注入下腔静脉

C.收集左肋间后静脉的血液

D.只收集食管静脉的血液

E.起自左腰升静脉

A. chronic pain
B. brain chemical
C. nerve receptors
D. a clear definition
E. damaged nerves
F. painkilling therapies
G. an emotional response

People suffer both physically and emotionally if they have ______.