Amnesia is

Options

A. Loss of memory
B. Loss of filtration capacity of kidney
C. Loss of appetite
D. Loss of blood

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Amnesia**: Amnesia is primarily defined as a loss of memory. It is a condition that affects an individual's ability to recall past experiences and information.

2. **Causes of Amnesia**: The most common cause of amnesia is brain injury. This injury can result from various factors such as trauma, stroke, or diseases that affect the brain.

3. **Impact on Memory**: Individuals suffering from amnesia have difficulty remembering past experiences and information. This can include personal memories, learned facts, and other types of knowledge that were previously stored in the brain.

4. **Amnestic Syndrome**: When a person experiences amnesia, they may be diagnosed with amnestic syndrome. This syndrome is characterized not only by the inability to recall past memories but also by challenges in forming new memories.

5. **Difficulty in Memory Formation**: In addition to forgetting past information, individuals with amnesia often find it hard to create new memories or retain new information. This dual challenge significantly impacts their daily life and functioning.

6. **Conclusion**: Therefore, amnesia is specifically related to memory loss due to brain injury, affecting both the recall of past experiences and the ability to form new memories.