**Core Concept**
The reservoir of Herpes Simplex Virus (HSV) refers to the site where the virus remains latent, or dormant, between outbreaks. This concept is crucial in understanding the pathophysiology of HSV infections.

**Why the Correct Answer is Right**
HSV primarily infects neurons in the peripheral nervous system, particularly in the trigeminal ganglion for HSV-1 and the sacral ganglia for HSV-2. During latency, the virus remains in a dormant state, with minimal viral replication and no clinical symptoms. However, the virus can reactivate, leading to recurrent episodes of herpes labialis (HSV-1) or genital herpes (HSV-2). The latent virus is protected from the immune system by the blood-nerve barrier, allowing it to persist indefinitely.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because HSV is not primarily found in the lymphoid organs, such as the spleen or lymph nodes. While these organs may be involved in the immune response to HSV, they are not the reservoir of the virus.
* **Option B:** This option is incorrect because the epidermis is the outermost layer of the skin, and while it may be affected by HSV lesions, it is not the site where the virus remains latent.
* **Option C:** This option is incorrect because the liver is not a common site for HSV latency. While the liver may be affected by systemic infections, it is not directly involved in the pathogenesis of HSV.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that HSV can be transmitted through asymptomatic shedding, even when there are no visible lesions. This highlights the importance of using protective measures, such as condoms, to prevent the spread of HSV.

**Correct Answer:** C.