患儿,5岁。因面色苍白、反复上呼吸道感染入院,经检查诊断为巨幼细胞贫血.若该患儿无神经系统症状,首选的药物是
A 维生素B<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20240806/12859909_0.gif">,叶酸 B
叶酸 C
维生素B<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20240806/12859909_0_1.gif"> D
维生素C E
维生素B<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20240806/12859909_0_2.gif">