[R] How do I delete a row from a data frame when varA == "TRUE"

[kxk]

I want to delete a row from a data frame XYZ where A == "TRUE".  Let's assume
there are five variables in this data frame XYZ.  My deletion is based on
the TRUE vs. FALSE value under variable A.  How do I do this?  Thanks!

My current code: 
for (i in 1:length(XYZ$A)) if (XYZ$A == "FALSE") XYZ<-XYZ else XYZ<-
XYZ[-i,]

Error message is:
Error in if (XYZ$A == "FALSE") XYZ<-XYZ else XYZ<- XYZ[-i,  : 
  missing value where TRUE/FALSE needed


Please help!!
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