**Core Concept**
Pulmonary embolism (PE) is a blockage of an artery in the lungs by a blood clot, often originating from the deep veins of the legs. The clinical presentation and management of PE are critical in emergency medicine.

**Why the Correct Answer is Right**
Chest pain is indeed a common symptom of pulmonary embolism, but it is not the most common symptom. The most common symptom of PE is dyspnea (shortness of breath). Chest pain occurs in approximately 50-60% of patients, but it is often pleuritic in nature, meaning it worsens with breathing. Dyspnea is present in up to 80% of patients. This discrepancy in prevalence may be due to the fact that dyspnea is a more subtle symptom that can be easily attributed to other conditions, whereas chest pain is typically more severe and attention-grabbing.

**Why Each Wrong Option is Incorrect**
**Option B:** While it is true that pulmonary embolism often arises from leg veins, option B is not the false statement. The false statement is about the symptom most commonly associated with pulmonary embolism.
**Option C:** It is true that the longer the survival time, the greater the chance of recovery in pulmonary embolism. Patients who are hemodynamically stable and receive prompt treatment have a much better prognosis than those who are unstable.
**Option D:** Neck veins may indeed be distended in pulmonary embolism, especially in patients who are hypotensive or have a large clot burden. Distended neck veins are a sign of increased jugular venous pressure, which can occur in PE due to the obstruction of blood flow to the lungs.

**Clinical Pearl / High-Yield Fact**
A classic clinical pearl for diagnosing pulmonary embolism is the "Wells score," which includes several clinical factors such as clinical symptoms (e.g., dyspnea, chest pain), signs (e.g., tachycardia, hypotension), and laboratory values (e.g., elevated D-dimer). A score of 4 or higher is highly suggestive of PE.

**✓ Correct Answer: A. Chest pain is most common symptom**