The correct answer is option 1: Compact fluorescent lamp. Compact fluorescent lamps (CFLs) contain a small amount of mercury vapor, which is a poisonous gas. While CFLs are energy efficient and widely used, it is important to handle and dispose of them safely to avoid any exposure to the poisonous gas.

Option 2: Light emitting diode (LED) lamps do not contain any poisonous gas. LED lamps use solid-state technology and do not emit any harmful substances. They are considered safe and environmentally friendly.

Option 3: Neon lamps do not contain poisonous gas. Neon lamps use neon gas, which is not toxic. They are commonly used in signs and displays.

Option 4: Halogen lamps do not contain poisonous gas. Halogen lamps use a small amount of halogen gas, which is not classified as poisonous. However, halogen lamps can become very hot during operation and should be handled with care to prevent burns.

It is important to dispose of CFLs properly by taking them to a recycling center or a designated collection point. This ensures that the mercury vapor is safely contained and does not harm the environment or human health.