What does the doctor’s “note” mean?

题目

What does the doctor’s “note” mean?
When you go to see a doctor,he will write you a note to take to the chemist for some medicine.Chemists are usually good at reading doctors’ notes.But sometimes doctors write so badly that even the chemist cannot read the notes.
One day a man wrote to a doctor to invite him to have dinner at his house.The doctor wrote a reply,but he wrote too badly and the man could not read it.
“What shall I do?” he asked his wife,“I don’t know whether he is going to come or not.I don’t want to call him and say that I don’t understand him.”
His wife thought for a while and then she had an idea.“Take it to the chemist,” she said.“He will be able to read it for us.”
“Thank you,” said her husband.“That’s a good idea.”
He went to the chemist’s and gave the doctor’s “note” to him.The chemist looked at it for a long time.
“Could you wait a moment,sir?” he said.Then he went to the back of his shop.After a few minutes he came back,carrying a la

答案

这是一个笑话
笑点是抓药的也不知道医生写的什么,他还以为那是一个处方呢.
联想到生活中就是:你看病 ,药店里给你的药和医生给你的处方并不是总一样的.
还有问题问出来
真逗...
并且,笑话里没有这个问题的答案.