Hello @kartik,
You can follow this snippet below:
MAYBECHOICE = (
    ('y', 'Yes'),
    ('n', 'No'),
    ('u', 'Unknown'),
)
And you define a charfield in your model :
married = models.CharField(max_length=1, choices=MAYBECHOICE)
You can do the same with integer fields if you don't like to have letters in your db.
In that case, rewrite your choices:
MAYBECHOICE = (
    (0, 'Yes'),
    (1, 'No'),
    (2, 'Unknown'),
)
Thank You!