Beacon lights are obtained from:
A.Neon lamps
B.Tungsten lamps
C.Hydrogen lamps
D.Xenon lamps

Hint: To solve this question one must know what beacon lights are and what they are used for. By understanding the properties and purpose of beacon lights one can solve this problem. Beacon lights are usually used to warn or guide people. Therefore these lights must be able to travel large distances and also be easily visible through fogs.

Complete answer:
Beacon lights:
These are red flashing lights that are usually fitted on the top and bottom fuselage of an aircraft. The purpose of these lights is to alert ground crew or other aircraft that an engine is starting up, shutting down or that the aircraft is about to move.
These lights are bright enough such that they are visible from the ground. So that even in dark, foggy, or even overcast conditions, the plane must be identifiable.
These lights are used to get the attention of people to either issue warnings or guide them.
Neon lamps have the property to pass through fog efficiently and also neon light is capable of traveling long distances. Therefore for this reason beacon lights are obtained from neon lights. Hence, this is the correct option.
From the above discussion, we can conclude that the correct option for this question is neon lamps. Therefore tungsten lamps are not the right option.
As neon light can travel long distances and also that they can easily be seen through fog, a neon lamp is preferred over a hydrogen lamp.
For beacon lights, the light used is neon and not a xenon lamp.

Note:
In the above passage, we have discussed that neon lights have the property to pass through fog efficiently and also that neon light is capable of traveling long distances. Hence, for this reason, beacon lights are obtained from neon lights. The purpose of beacon lights is that they should be visible whether in fog or overcast conditions to warn or guide people.