{% set queCount = loop.index %}
{% for row2 in answer+queCount %}

$count = 1;
$args["answer$count"]

$args["answer1"]

{% set queCount = loop.index %}
{% for row2 in _context['answer' ~ queCount] %}

{% for row2 in attribute(args, 'answer' ~ queCount) %}
    ...
{% endfor %}

{% set queCount = loop.index %}
{% for row2 in _context['answer' ~ queCount]|default(null) %}

{% for row2 in _context['answer' ~ queCount]|default() %}

{% for row2 in _context['answer' ~ queCount]|default %}