Autonomic nervous system cosists of

Options

A. Brain and spinal cord
B. Cranial and spinal nerves
C. Sympathetic and parasympathetic nervous system
D. Brain and cranial nerves

Explanation

### Step-by-Step Solution:

1. **Understanding the Autonomic Nervous System (ANS)**:
- The autonomic nervous system is a component of the nervous system that regulates involuntary bodily functions, including heart rate, digestion, and respiratory rate.

2. **Divisions of the Autonomic Nervous System**:
- The ANS is primarily divided into two main parts:
- **Sympathetic Nervous System**: This part prepares the body for stressful or emergency situations, often referred to as the "fight or flight" response.
- **Parasympathetic Nervous System**: This part conserves energy and is responsible for the "rest and digest" functions.

3. **Evaluating the Options**:
- **Option 1**: Brain and spinal cord - This refers to the central nervous system (CNS), not specifically the ANS.
- **Option 2**: Cranial and spinal nerves - These are parts of the peripheral nervous system (PNS), not specifically the ANS.
- **Option 3**: Sympathetic and parasympathetic nervous system - This correctly identifies the two main components of the autonomic nervous system.
- **Option 4**: Brain and cranial nerves - Again, this refers to parts of the CNS and PNS, not specifically the ANS.

4. **Conclusion**:
- Based on the definitions and evaluations of the options, the correct answer is **Option 3: sympathetic and parasympathetic nervous system**.