Boy or Girl?

The following is a conversation between my mom and Makenna.

Nana: Makenna, is Colin a boy or a girl?
Makenna: Boy
Nana: Makenna, is mama a boy or a girl?
Makenna: Girl
Nana: Makenna, is daddy a boy or a girl?
Makenna: Boy
Nana: Makenna, is papa a boy or a girl?
Makenna: Boy
Nana: Makenna, is nana a boy or a girl?
a long dramatic pause takes place while Makenna thinks about this question
Nana: Makenna, is nana a boy or a girl?
after a short pause to think some more she boldly declares
Makenna: A COW!