PTA Physical Therapy Assistant

Answer: A - Return of the multiple sclerosis symptoms following a hot bath is known as Uhthoff’s phenomenon.

Multiple sclerosis is the demyelinating disease of the nervous system. It is an autoimmune disorder.
The relapse of symptoms occurs due to various reasons, such as trauma. However, relapse of symptoms due to a hot bath, hot weather, a fever etc. from which the body is overheated is known as Uhthoff’s phenomenon.

The other options mentioned are also features of multiple sclerosis. Sudden neck flexion will evoke a shock-like sensation in the limbs known as Lhermitte’s sign. This occurs when there is an involvement of the posterior column.