The wife of a client with bipolar disorder, manic phase, states to the nurse, “He's acting so crazy. What did he do to get this way?” The nurse bases the response on the understanding of which of the...

The wife of a client with bipolar disorder, manic phase, states to the nurse, “He's acting so crazy. What did he do to get this way?” The nurse bases the response on the understanding of which of the following about this disorder?

1. It is caused by underlying psychological difficulties.

2. It is caused by disturbed family dynamics in the client's early life.

3. It is the result of an imbalance of chemicals in the brain.

4. It is the result of a genetic inheritance from someone in the family.