Riddle: What is the answer of Egg Heart?

Tip: Neihuang has a long history and culture and belongs to the birthplace of Chinese culture. Neihuang is the tomb of Shang Yang, a statesman in the Spring and Autumn Period, Wei Ran Ran Min, emperor in the Sixteen Countries Period of the Eastern Jin Dynasty, and Zheng Shi, a great poet in the Tang Dynasty. It is the place where Xiang Yu, the overlord of Chu, seized the army to save Zhao He, and it is also the place where Yue Fei, a national hero, lived and grew up in his childhood.

Mystery: Egg Heart (playing a place name in Henan)

Answer: yellow inside.