- First-aid instant cold pack is a kind of cold pack
- Cold pack reaction is a kind of endothermic reaction
- Hence, first-aid instant cold pack is a kind of endothermic reaction

Hence, first-aid instant cold pack is a kind of endothermic reaction
Q: Which of these is an example of an endothermic process?
Context:
- First-aid instant cold pack is a kind of cold pack 
- Cold pack reaction is a kind of endothermic reaction