**Core Concept:**
Lithium is a commonly used medication for the treatment of bipolar disorder and is effective in reducing the occurrence of manic and depressive episodes. However, lithium usage can lead to side effects, including tremors. These tremors are due to the inhibition of the enzyme choline acetyltransferase (ChAT), which is responsible for the synthesis of acetylcholine, a neurotransmitter involved in muscle control and coordination.

**Why the Correct Answer is Right:**
The correct answer, **D**, refers to the treatment of lithium-induced tremors. Lithium-induced tremors are typically dose-dependent and are more prominent in the hands, but can affect other parts of the body as well. The treatment involves reducing the lithium dosage. However, abruptly stopping lithium can lead to lithium withdrawal symptoms. Therefore, a gradual reduction in lithium dosage is recommended.

**Why Each Wrong Option is Incorrect:**
A. Lithium toxicity is managed by increasing the lithium dosage, which would worsen the tremors, not treat them.
B. Lithium-induced tremors are primarily managed through reducing the lithium dosage, not increasing it.
C. Electrolyte imbalances, which could cause similar symptoms to lithium-induced tremors, are treated by correcting the imbalance, not reducing the lithium dosage.

**Clinical Pearl:**
When managing lithium-induced tremors, it is essential to consider the underlying mechanism. Lithium's tremor-inducing effect is due to its inhibition of Choline acetyltransferase (ChAT), an enzyme involved in the synthesis of acetylcholine. Lithium-induced tremors are typically managed by reducing the lithium dosage to prevent lithium toxicity and its associated symptoms.