Most common receptor for typical antipsychotics is ?

**Core Concept**
Typical antipsychotics, also known as first-generation antipsychotics, primarily work by blocking dopamine receptors in the brain, particularly in the mesolimbic pathway. This blockade results in a reduction of dopaminergic activity, leading to their therapeutic effects in treating psychosis.

**Why the Correct Answer is Right**
The most common receptor targeted by typical antipsychotics is the D2 receptor. This is because D2 receptors are densely populated in the mesolimbic pathway, which is involved in the regulation of emotions, motivation, and cognition. By blocking D2 receptors, typical antipsychotics can reduce the excessive dopaminergic activity that contributes to psychotic symptoms. The blockade of D2 receptors also leads to an increase in the activity of the nigrostriatal pathway, which can result in extrapyramidal side effects such as tremors and rigidity.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it is not a specific type of receptor that is commonly targeted by typical antipsychotics.
* **Option B:** This option is incorrect because while serotonin receptors are also targeted by some antipsychotics, they are not the primary receptor targeted by typical antipsychotics.
* **Option D:** This option is incorrect because alpha-adrenergic receptors are not the primary receptor targeted by typical antipsychotics.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that the blockade of D2 receptors by typical antipsychotics can lead to extrapyramidal side effects, which can be managed with anticholinergic medications or by switching to atypical antipsychotics.

**Correct Answer: C. D2 receptor**