**Core Concept**
Selective serotonin reuptake inhibitors (SSRIs) are a class of antidepressant medications that increase the levels of serotonin in the brain by inhibiting its reuptake. The discontinuation of SSRIs can lead to withdrawal symptoms due to the sudden decrease in serotonin levels.

**Why the Correct Answer is Right**
The risk of drug discontinuation symptoms is related to the half-life of the drug. Drugs with a shorter half-life are more likely to cause withdrawal symptoms when stopped abruptly. Fluoxetine, a SSRI with a longer half-life (2-4 days), has a lower risk of causing drug discontinuation symptoms compared to other SSRIs with shorter half-lives. This is because the gradual decrease in fluoxetine levels allows for a more gradual decrease in serotonin levels, reducing the severity of withdrawal symptoms.

**Why Each Wrong Option is Incorrect**
**Option A:** Sertraline has a half-life of 25-30 hours, which is shorter than fluoxetine, making it a less ideal choice for minimizing drug discontinuation symptoms.
**Option B:** Paroxetine has a half-life of 21 hours, which is even shorter than sertraline, increasing the risk of withdrawal symptoms.
**Option C:** Citalopram has a half-life of 35 hours, but its active metabolite, desmethylcitalopram, has a longer half-life, which may not be sufficient to minimize withdrawal symptoms.

**Clinical Pearl / High-Yield Fact**
When stopping SSRIs, it's essential to taper the dose gradually over a period of weeks to minimize the risk of withdrawal symptoms. This allows the body to adjust to the decreasing levels of the medication, reducing the severity of withdrawal symptoms.

**Correct Answer:** A. Fluoxetine, as it has a longer half-life and a lower risk of causing drug discontinuation symptoms.