**Core Concept:** Acute Respiratory Distress Syndrome (ARDS) is a severe form of acute lung injury characterized by bilateral pulmonary infiltrates, hypoxemia, and bilateral airspace opacities. It was initially described due to its clinical manifestations and pathophysiology.

**Why the Correct Answer is Right:** The correct answer is "1967" because in that year, the ARDS definition was first described by the American Thoracic Society (ATS) and the European Society of Intensive Care Medicine (ESICM). The definition is based on clinical criteria, including bilateral pulmonary infiltrates, hypoxemia, and bilateral airspace opacities. ARDS is a critical condition that requires early recognition and appropriate management for better patient outcomes.

**Why Each Wrong Option is Incorrect:**

A. 1960: This is too early. ARDS was first described in 1967, not 1960.
B. 1990s: This is incorrect because ARDS was first defined in 1967, not in the 1990s.
C. 2000s: This is incorrect as ARDS was first defined in 1967, not in the 2000s.
D. 2010s: The correct answer is 1967, not the 2010s.

**Clinical Pearl / High-Yield Fact:** The early recognition and management of ARDS are crucial for improving patient outcomes. Timely use of ventilator strategies, such as low tidal volumes, protective lung ventilation, and prone positioning, can significantly reduce mortality in ARDS patients.