苯巴比妥可与吡啶和硫酸铜溶液作用,生成（  ）

A、<span style=";font-family:宋体;font-size:14px">绿色络合物&nbsp;</span>

B、<span style=";font-family:宋体;font-size:14px">紫堇色络合物</span>

C、<span style=";font-family:宋体;font-size:14px">白色胶状沉淀</span>

D、<span style=";font-family:宋体;font-size:14px">氨气</span>