How does IOS choose what IPv6 source address to use?

I have a 3750X with IOS 15.2.2E.
I have multiple IPv6 addresses on the default VLAN (VLAN 1):
ipv6 address 2001:470:...../64
ipv6 address 2001:470:...../64
ipv6 address 2605:A000:..../64
I have one default IPv6 route:
ipv6 route ::/0 Vlan1 FE80::.....
S ::/0 [1/0]
via FE80::....., Vlan1
My question is: when I issue a ping from the 3750X, how does the switch choose what source address to use?
Currently, it seems to use the 2605:A000 address, but why?
Can I change this behavior?
Thanks!

OK,
How about my second question: Can I change this behavior in IOS?
Thanks!

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How does IOS choose what IPv6 source address to use?

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