Correct
考证
/ kǎozhèng /
Strokes
Definition
to do textual research/to make textual criticism/to verify by means of research (esp. historical details)/to take an exam to get a certificate (abbr. for 考取证件[kǎo qǔ zhèng jiàn])
Example
As a Verb
make textual criticism; do textual research
1
Zhège
这个
wèntí
问题
yǒudài
有待
kǎozhèng
考证
。
This issue is still to be put to textual research.