> Who rob banks? Robbers. (i.e. I don't think 'Robbers robs banks' is right.) “Robbers robs banks” is certainly wrong (it should be “Robbers rob banks”), but s

> Who rob banks? Robbers. (i.e. I don't think 'Robbers robs banks' is right.) “Robbers robs banks” is certainly wrong (it should be “Robbers rob banks”), but so is “Who rob banks?” (it should be “Who robs banks?”).