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 determine which statement is correct regarding the largest part of the human brain, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Largest Part of the Human Brain**:
- The largest part of the human brain is the **cerebrum**, which is part of the **forebrain**.

2. **Evaluate Each Option**:
- **Option 1**: "It maintains balance and coordination."
- This function is primarily performed by the **cerebellum**, which is not the largest part of the brain. Therefore, this option is **incorrect**.

- **Option 2**: "It controls involuntary reflex and action."
- The **brain stem** is responsible for controlling involuntary reflexes and actions. Since the brain stem is not the largest part of the brain, this option is also **incorrect**.

- **Option 3**: "It controls nerve fiber connecting different regions of the brain."
- The **corpus callosum** connects the left and right hemispheres of the cerebrum, but it is not the largest part of the brain. Hence, this option is **incorrect**.

- **Option 4**: "It controls all motor and sensory activity."
- This function is indeed performed by the **cerebrum**, which is the largest part of the brain. Therefore, this option is **correct**.

3. **Conclusion**:
- The correct answer is **Option 4**: "It controls all motor and sensory activity."