Obtaining related model name during form creation

In __init__ in my form class I have:

for name, field in self.fields.items():
model_field = self.instance._meta.get_field_by_name(name)[0]
if isinstance(field, forms.models.ModelChoiceField): # foreign key
x = getattr(self.instance, name, '') # representation of related instance

How can I obtain the class name of related model?

Axel
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