**Core Concept:**
The process of converting short-term memory into long-term memory is a crucial aspect of human cognition and plays a vital role in retaining information for later use. Short-term memory typically lasts for a few seconds to a few minutes, while long-term memory can persist for years or even a lifetime. This conversion involves the consolidation of memories and the strengthening of neural connections in the brain.

**Why the Correct Answer is Right:**
The correct answer is **Option C: Hippocampus and Entorhinal Cortex**. These two brain regions are essential for the process of memory consolidation, which is the critical step in converting short-term memories into long-term memories. The hippocampus is primarily involved in the formation of new memories, particularly spatial and episodic memories. The entorhinal cortex, on the other hand, plays a crucial role in the transmission of information from the hippocampus to other brain regions, facilitating the integration and consolidation of memories.

**Why Each Wrong Option is Incorrect:**
Option A (Hypothalamus) and Option B (Thalamus) are incorrect because they are not primarily involved in memory consolidation processes. The hypothalamus is more associated with regulating physiological functions, while the thalamus plays a role in sensory processing and integration.

Option D (Cerebral Cortex) is also incorrect as while the cerebral cortex is involved in various cognitive processes, memory consolidation is more closely linked to the hippocampus and entorhinal cortex.

**Clinical Pearl:**
A well-known clinical scenario regarding memory is Alzheimer's disease, which is characterized by the progressive degeneration of the hippocampus and entorhinal cortex, leading to severe memory loss. Understanding the role of these brain regions in memory consolidation is essential in comprehending the pathophysiology of memory disorders.