What is the hottest planet in the solar system?
Venus is the hottest planet in the solar system.  Its surface is hotter than the inside of an oven. Venus is covered in a blanket of thick, yellow gas, 96.5% Carbon Dioxide, which traps heat from the Sun without letting it escape.  Hence Venus can't cool down.
Instruction: What is the hottest planet in the solar system?
Context: 
Response: Venus is the hottest planet in the solar system.  Its surface is hotter than the inside of an oven. Venus is covered in a blanket of thick, yellow gas, 96.5% Carbon Dioxide, which traps heat from the Sun without letting it escape.  Hence Venus can't cool down.