Answer: A

Sini Decoction can warm the middle and dispel cold, restore Yang and relieve Ni, so the answer is A. The function of Liujunzi Pill is to nourish the spleen and replenish qi, dry dampness and resolve phlegm, so B is excluded. The function of Xiaoqinglong Capsule is to relieve symptoms and dissolve fluids, relieve cough and asthma, so C is excluded. The function of Fuzi Lizhong Pills is to warm the body and strengthen the spleen, so D is excluded. The function of Xiaojianzhong Mixture is to warm the body and replenish deficiency, relieve pain and relieve pain, so E is excluded.