On Tue, Dec 17, 2013 at 04:21:35PM +0800,
 Jianjun Ning <[email protected]> wrote 
 a message of 61 lines which said:

> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags:; MBZ: 0005 , udp: 512
> ;; QUESTION SECTION:
> ;www.google.com.hk.             IN      A
> 
> The value of field MBZ is 0x0005!!

The Google authoritative name servers do not seem to return a EDNS
section in their answers. Therefore, this section has probably been
added by your resolver, or by a middleman (something which is quite
common in China).
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