**Core Concept**
Anaesthesia induction in children involves selecting agents that are safe, effective, and minimize stress and discomfort. The ideal agents should have a pleasant odor, be non-irritating to the respiratory tract, and have a smooth onset of action.

**Why the Correct Answer is Right**
Morphine is an opioid analgesic that is typically used for pain management and sedation, but it is not used for induction of anaesthesia due to its slow onset of action, potential respiratory depression, and risk of causing histamine release, which can lead to hypotension. In contrast, inhalational agents like halothane and sevoflurane are commonly used for induction in children due to their rapid onset and pleasant odors. Nitrous oxide (N2O) is also used for induction in children as it is non-irritating to the respiratory tract and has a smooth onset of action.

**Why Each Wrong Option is Incorrect**
**Option A:** Halothane is a commonly used inhalational agent for induction of anaesthesia in children due to its pleasant odor and rapid onset of action.
**Option B:** Sevoflurane is another commonly used inhalational agent for induction in children, known for its non-irritating properties and smooth onset of action.
**Option D:** N2O is a widely used gas for induction of anaesthesia in children, offering a non-irritating and smooth onset of action.

**Clinical Pearl / High-Yield Fact**
When choosing an agent for induction of anaesthesia in children, it's essential to consider their age, weight, and medical history. Inhalational agents like sevoflurane and halothane are generally preferred over opioids like morphine due to their rapid onset and smooth action.

**Correct Answer:**
✓ Correct Answer: C. Morphine.