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

[Q]: What type of equipment is used with liquid oxygen but not other methods of oxygen storage?, Context: Oxygen storage methods include high pressure oxygen tanks, cryogenics and chemical compounds. For reasons of economy, oxygen is often transported in bulk as a liquid in specially insulated tankers, since one liter of liquefied oxygen is equivalent to 840 liters of gaseous oxygen at atmospheric pressure and 20 C (68 F). Such tankers are used to refill bulk liquid oxygen storage containers, which stand outside hospitals and other institutions with a need for large volumes of pure oxygen gas. Liquid oxygen is passed through heat exchangers, which convert the cryogenic liquid into gas before it enters the building. Oxygen is also stored and shipped in smaller cylinders containing the compressed gas; a form that is useful in certain portable medical applications and oxy-fuel welding and cutting.
[A]: heat exchangers

[Q]: The second Multilingual European subset includes everything from which other Unicode subsets?, Context: Several subsets of Unicode are standardized: Microsoft Windows since Windows NT 4.0 supports WGL-4 with 652 characters, which is considered to support all contemporary European languages using the Latin, Greek, or Cyrillic script. Other standardized subsets of Unicode include the Multilingual European Subsets: MES-1 (Latin scripts only, 335 characters), MES-2 (Latin, Greek and Cyrillic 1062 characters) and MES-3A & MES-3B (two larger subsets, not shown here). Note that MES-2 includes every character in MES-1 and WGL-4.
[A]: MES-1 and WGL-4

[Q]: What activity that involves visting farms is available in the state Andy Griffith was born in?, Context: North Carolina provides a large range of recreational activities, from swimming at the beach to skiing in the mountains. North Carolina offers fall colors, freshwater and saltwater fishing, hunting, birdwatching, agritourism, ATV trails, ballooning, rock climbing, biking, hiking, skiing, boating and sailing, camping, canoeing, caving (spelunking), gardens, and arboretums. North Carolina has theme parks, aquariums, museums, historic sites, lighthouses, elegant theaters, concert halls, and fine dining.
[A]:
agritourism