In Custom fileds drop down option none defaults --How do I delete the same

[NAVEEN KUMAR C]

In  Custom fileds drop down option none  value defaults --How do I delete the same .

Along with the other options added in drop down none value appears. I am not getting option to delete this value.  

[Nic Brough -Adaptavist-]

If you delete "none", your users will have no intuitive way to say "this field should have no entry", which will lead to random poor or stupid data being entered.  Removing the "none" option is not a good idea.

Make the field mandatory, then your users will have to enter something.  Think about giving it a default value too

[Steven F Behnke]

There will always be a none option unless the field has a default option and is required.

[NAVEEN KUMAR C]

OK . I want delete that none value in the drop down.  I do want to any one choose value none from drop down. So guide me to  delete the none value  from drop down.