Pls Answer to the Question

I asked a patient if he has allergies to medicine today, and he said he is allergic to strong medicine. When I asked him what strong medicine, he got irritated and said he's old so he is allergic to strong medicine. What kind of stupid answer is that. There is no such thing as strong medicine causing allergies, and besides when talking about medicine potency you can only compare within the same class of medication. To do otherwise is something like comparing apples with bananas and then saying a particular brand of apple is better than another brand of bananas.

When I tried to correct his concept of strong medicine causing allergies, he became irritated and said his son is a doctor and he knows that he is allergic to strong medicines. What has the son being a doctor got to do with this?! If the son thinks strong medicines can cause allergies then I think Singaporeans should start worrying about the kind of medical care they are receiving.