In the letter "C"

The real case. Everything happened before my eyes. Now I respect women's logic. I'm deadly serious.
Here is how it was. Mother-in-law came to visit us.
In the morning my wife and I go to work.
Wife:
 - It is necessary to buy mom ointment for the eyes.
I am of course! (We are each other's mother-in och.uvazhaem!)
We go on the road to the chemist.
Wife:
 - Do you have an ointment for the eyes?
Chemist:
 - There is. and what you?
Wife:
 - The letter "C»
Chemist:
 - Tsintamitsinovaya?
Wife:
 - No
The chemist calls a few more options on the letter "C". does not fit one.
Wife:
 - You show me and I'll tell you whether or not this ointment.
Chemist:
 - As I'll show you, if you do not know what?
Wife: You're a pharmacist, you need to know!
In short, the two women quarreled specifically. Took to the streets across more pharmacy. My wife wants to go there. I, of course, against it, it is very foolish we looked at earlier, but the ointment is needed, and we're going!
The dialogue in the next pharmacy:
Wife:
_ Hello! you ointment for the eyes?
Aptekarsha№2:
 - What?
Wife:
 - The letter "C»
Aptekarsha№2:
 - Tetracycline?
Wife:
 - YES!
I'm in shock! How do they understand each other? incomprehensible to my mind female logic! it exists, and I'm a fan of it!