That's your responsibility. ✬

Why don't you look into the problem yourself? It's your responsibility. ✬

I will accept full responsibility for this. ✬

I take full responsibility for the action. ✬

I'll take the responsibility on my shoulders. ✬

He has a strong sense of responsibility. ✬

With great power comes great responsibility. ✬

The responsibility is mine. ✬

I think it's time for me to accept responsibility for that problem. ✬

Tom has a strong sense of responsibility. ✬