How to remove element from json web service when using _serialize in Cakephp?

Cakephp _serialize() automatically appends a <response> element when it is used to generate a json web service. This <response> element causes problem for the front-end to parse. How can this <response> element be removed from Cakephp? I am using Cakephp 2.4.5

http://book.cakephp.org/2.0/en/views/json-and-xml-views.html

I asked this question on Stack Overflow but could not get any answers. I wonder if the experts here can give me some advice. Thanks a lot in advance.

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