下列有关抗体的叙述，错误的是 [ ]

A．抗体是由淋巴细胞产生的     

B．抗体是一种蛋白质     

C．一种抗体能消灭多种抗原     

D．抗体是在抗原物质侵入人体后产生的

_____ the doctors insisted on was that they _____ more respect and sense of security. [ ]

A. That; must be given      

B. What; should give

C. That; would be given  

D. What; should be given