fix eval_answer refactor regression
fix eval_answer refactor regression

nnamon/coursemology.org,allenwq/coursemology.org,allenwq/coursemology.org,dariusf/coursemology.org,Coursemology/coursemology.org,nnamon/coursemology.org,Coursemology/coursemology.org,nnamon/coursemology.org,dariusf/coursemology.org,dariusf/coursemology.org,Coursemology/coursemology.org,dariusf/coursemology.org,allenwq/coursemology.org,dariusf/coursemology.org,Coursemology/coursemology.org,allenwq/coursemology.org,nnamon/coursemology.org,Coursemology/coursemology.org,nnamon/coursemology.org,allenwq/coursemology.org