Which of the following is correct regarding the largest part of the human brain ?

Options

A. It maintains balance and coordination
B. It controls involuntary reflexes and actions
C. It contains nerve fibers connecting different regions of brain
D. It controls all motor and sensory activities.

Answer

To solve the question regarding the largest part of the human brain, we need to analyze each of the provided options and determine which one correctly describes the functions of the largest part of the brain, which is the cerebrum.

### Step-by-Step Solution:

1. **Identify the Largest Part of the Brain**:
- The largest part of the human brain is the cerebrum, which is divided into two hemispheres (left and right).

2. **Evaluate Each Option**:
- **Option 1**: "It maintains balance and coordination."
- This statement is incorrect. The cerebellum, not the cerebrum, is responsible for maintaining balance and coordination.

- **Option 2**: "It controls involuntary reflexes and actions."
- This statement is also incorrect. The brain stem is responsible for controlling involuntary reflexes and actions, not the cerebrum.

- **Option 3**: "It contains the nerve fibers connecting different regions of the brain."
- This statement is misleading. While the cerebrum does have connections, the primary structure that connects the two hemispheres of the cerebrum is the corpus callosum. Therefore, this option is not entirely correct.

- **Option 4**: "It controls all motor and sensory activities."
- This statement is correct. The cerebrum is responsible for processing sensory information and controlling voluntary motor functions.

3. **Conclusion**:
- The correct answer is **Option 4**, as it accurately describes the role of the cerebrum in controlling motor and sensory activities.