question: What did the query starter believe to be the ultimate difficulty in accepting the a virgin conception of Mary ?
answer: How can there be absence of sin where there is concupiscence ( libido ) ?
turker_answer: The query starter believed the ultimate difficulty in accepting the a virgin conception of Mary was how can there be absence of sin where there is concupiscence ( libido ) to be .
rule-based: The query starter believed how can there be absence of sin where there is concupiscence ( libido ) to be the ultimate difficulty in accepting the a virgin conception of Mary .