**Core Concept**
Milan criteria are a set of guidelines used to assess the suitability of patients with cirrhosis for liver transplantation, focusing on the liver's functional status and the presence of complications. These criteria were developed by a team of experts in the field, including Dr. Franco B. Porreca and Dr. Franco B. Buhler, in the 1990s.

**Why the Correct Answer is Right**
The Milan criteria are a set of strict criteria that help identify patients with cirrhosis who are likely to benefit from liver transplantation. These criteria include:
* A single tumor ≤ 5 cm in size, or
* Up to 3 tumors, all of which are ≤ 3 cm in size.
The Milan criteria are based on the idea that patients with early-stage hepatocellular carcinoma (HCC) who meet these criteria have a good prognosis after liver transplantation. The criteria also take into account the presence of liver cirrhosis, which can affect the liver's functional status and the patient's overall health.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not correct because the Milan criteria are not used for assessing the suitability of patients for other types of organ transplantation, such as kidney or heart transplantation.
* **Option B:** This option is not correct because the MELD (Model for End-Stage Liver Disease) score is a different set of criteria used to prioritize patients for liver transplantation based on their liver function and disease severity.
* **Option C:** This option is not correct because the Child-Pugh score is a system used to assess the severity of liver disease in patients with cirrhosis, but it is not a set of criteria for selecting patients for liver transplantation.

**Clinical Pearl / High-Yield Fact**
The Milan criteria are a strict set of guidelines that help identify patients with cirrhosis who are likely to benefit from liver transplantation. It's essential to remember that patients with HCC who meet the Milan criteria have a good prognosis after liver transplantation.

**Correct Answer:** C.