I want to know the answer to the following question:
Who concealed the identity of Emperor He's mother?
All the background I'm provided with is that "With the aid of the eunuch Zheng Zhong (d. 107 AD), Emperor He (r. 88–105 AD) had Empress Dowager Dou (d. 97 AD) put under house arrest and her clan stripped of power.". Is that enough to answer the question?