(For Sherlock) What's the fifth planet from the sun?

Submitted by sherlockian_demigod 

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I see this is an attempt to make a supposed fool out of me. As I have told John numerous times, a man's brain is like an attic, and he must stock it with such furniture he chooses that will help him in his career. 

(Note: When I handed Sherlock the computer to type his answer, it took him a few seconds to read, then leaned over and proceeded to ask me the very same question.)