They are asking you a question, if you actually said yes it is then a rhetorical question.
Another answer:
It also indicated disbelief on the part of the questioner that you said "yes".
Umm, yes
In Sicilian, you can say "èja" to mean yes.
If you say Mhm, that is supposed to mean yes
Certainly not. If you mean "psychopath", then I doubt anyone who is would say yes, and everyone else would say no. If I ask you "are you a liar?", would you say "yes", and if so , what do you mean?
In Portuguese, you can say "sim, senhor" to mean yes, sir.
if u mean it in military way, then "yest, ser". if u mean it just like polite version of yes, then we don't have it, just say "da" - yes.
Some say yes, some say no
yes. If you spell it, it means you say it.
no if you just say because you made a mistake. yes if you mean it.
In Portuguese, you can say "sim, obrigado" to mean "yes, thank you".
if you mean how do you say yes in spanish its "si" or if you say the letter "C" in english its the same.
If you want to say the word yes, then just enunciate the word. Be careful, yes is a powerful word. make sure you mean yes before you say it. No matter what the situation is.