def is_related(field):
    """
    Return True if the given field definition is a ForeignKey, OneToOneField, or
    ManyToManyField.

    >>> is_related(('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '100'}))
    False
    >>> is_related(('django.db.models.fields.related.ForeignKey', [], {'related_name': "'asdfadfa'", 'to': "orm['app_zeta.Model15']"}))
    True
    >>> is_related(('django.db.models.fields.related.OneToOneField', [], {'to': "orm['app_delta.Model09']", 'unique': 'True', 'null': 'True'}))
    True
    >>> is_related(('django.db.models.fields.related.ManyToManyField', [], {'to': "orm['app_delta.Model13']", 'symmetrical': 'False'}))
    True
    """
    return field[0] in (
        'django.db.models.fields.related.ForeignKey',
        'django.db.models.fields.related.OneToOneField',
        'django.db.models.fields.related.ManyToManyField',
    )