What is the radical of this kanji character?

The lower part of his jeans was dirty with mud.

He is working as my manservant.

Shimobe is my best friend.

He is a kind-hearted person.

He practices kanji every day.

The hypothalamus is a part of the brain, and it plays a role in regulating physiological functions such as body temperature and appetite.

Kokoro is my best friend.

His heart was very kind.

I thank you from the bottom of my heart.