Answer
See explanation.
Work Step by Step
Some points to ponder regarding the spark.
1. During dry day, the surrounding is dry enough to make sharp parts of the body receive and release electron quicker than it is in damp surrounding,
2. When you stroke a cat on dry day, electrons from cat fur has jumped to your finger. This makes your finger has excess electrons.
3. If you touch the cat's nose which functions as a little conductor, the electron from your finger immediately jumps to the cats nose, hence creating a painful spark.
