In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

What is a prerequisite for weight to play a factor in conductivity?, Context: While inert gas reduces filament evaporation, it also conducts heat from the filament, thereby cooling the filament and reducing efficiency. At constant pressure and temperature, the thermal conductivity of a gas depends upon the molecular weight of the gas and the cross sectional area of the gas molecules. Higher molecular weight gasses have lower thermal conductivity, because both the molecular weight is higher and also the cross sectional area is higher. Xenon gas improves efficiency because of its high molecular weight, but is also more expensive, so its use is limited to smaller lamps.
constant pressure and temperature

What does the S in "PBS" stand for?, Context: New York is also a major center for non-commercial educational media. The oldest public-access television channel in the United States is the Manhattan Neighborhood Network, founded in 1971. WNET is the city's major public television station and a primary source of national Public Broadcasting Service (PBS) television programming. WNYC, a public radio station owned by the city until 1997, has the largest public radio audience in the United States.
Service

Which of the following is not a culinary ingredient: spices, fish, or sour?, Context: Armenian cuisine is as ancient as the history of Armenia, a combination of different tastes and aromas. The food often has quite a distinct aroma. Closely related to eastern and Mediterranean cuisine, various spices, vegetables, fish, and fruits combine to present unique dishes. The main characteristics of Armenian cuisine are a reliance on the quality of the ingredients rather than heavily spicing food, the use of herbs, the use of wheat in a variety of forms, of legumes, nuts, and fruit (as a main ingredient as well as to sour food), and the stuffing of a wide variety of leaves.
sour