There's no medicine for a cold. A good sleep is the best cure for it.

感冒没有药可治，最好的方法就是好好睡一觉。

youdao

I think bed rest is the best medicine for a cold and hope that you will recover in no time at all.

我想卧床休息是治疗感冒的良药吧，希望你能尽快康复。

youdao

B. There is almost no medicine that can cure the cold.

不吃药你的感冒—周不能治愈。

youdao