Damper is also known as

In the context of automobile engineering, a "Damper" is also known as a Shock absorber. The primary function of a shock absorber in a vehicle is to dampen or absorb the shocks and vibrations caused by road irregularities, providing a smoother and more comfortable ride. It helps in maintaining contact between the tires and the road surface, improving stability and handling.

Option B, "Torsion bar," Option C, "Spring," and Option D, "Radius rod," are different components in an automobile suspension system and serve different purposes. None of them is synonymous with a damper or shock absorber.

Therefore, the correct term for a damper in an automobile context is Shock absorber.