**Core Concept**
Neonatal hypothermia is a significant concern in the first few days of life, particularly in low-resource settings. It occurs when the newborn's body temperature drops below 36.5°C, leading to increased morbidity and mortality. Preventing hypothermia is crucial, and various methods can be employed to achieve this goal.

**Why the Correct Answer is Right**
The correct answer is **B. Cold chain** because it is the opposite of what is needed to prevent neonatal hypothermia. Cold chain refers to the process of maintaining vaccines and medications at a refrigerated temperature to prevent degradation. In the context of neonatal care, using a cold chain would actually increase the risk of hypothermia, as it would expose the newborn to a lower temperature. In contrast, warm chain refers to the process of maintaining a warm environment for the newborn, which is essential for preventing hypothermia.

**Why Each Wrong Option is Incorrect**
**Option A:** Warm chain is a crucial method for preventing neonatal hypothermia. It involves maintaining a warm environment for the newborn, either through the use of radiant warmers or by keeping the baby close to the mother. This helps to regulate the baby's body temperature and prevent hypothermia.
**Option C:** Kangaroo Mother care (KMC) is a recommended method for preventing neonatal hypothermia. KMC involves skin-to-skin contact between the mother and the newborn, which helps to regulate the baby's body temperature and promote breastfeeding. This method has been shown to be effective in preventing hypothermia and reducing mortality rates in low-resource settings.
**Option D:** Radiant warmers are a common method for preventing neonatal hypothermia. These devices use infrared radiation to warm the baby, helping to regulate their body temperature and prevent hypothermia.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that prevention of neonatal hypothermia requires a multifaceted approach, including maintaining a warm environment, using radiant warmers, and promoting skin-to-skin contact between the mother and the newborn. Additionally, ensuring that the newborn is dried thoroughly after birth and is kept in a warm, draft-free environment can help to prevent hypothermia.

**✓ Correct Answer: B. Cold chain**