instruction:
Compose a new way to ask the same question. The new question must be asking the exact same thing as the original question does. Without any other information, you should be able to tell that the original question and the new question are the same. Preserve bracketed phrases in your new question. You can change the rest of the question provided the above requirements are satisfied. The new question must have a natural, fluent formulation, as if it were composed by a native English speaker. You will be given three pieces of information to help you create better questions. Those are: "Answer": the answer to the question, e.g., "Honolulu". "Answer Type": the type of the answer, e.g., "Location". "Auxiliary Information" is a detailed description of some concepts mentioned in the question, if any.
question:
original question: Find electric system whose locomotive class is [SBB-CFF-FFS Re 420].
answer: 15 kv ac railway electrification
answer type: Electric system.
auxiliary information: The Re 420, originally Re 4/4·¥µ·¥µ, series are the most common electric locomotives of the Swiss Federal Railways. They are used for passenger services throughout Switzerland alone or in pairs. For freight services, they are sometimes paired with the Re 620, especially in mountainous regions. That pairing is referred to by the term Re 10/10. The Re 430, originally known as the Re 4/4·¥µ·¥µ·¥µ, are a derivative of the Re 420 modified for higher traction but lower speed. The Re 420 locomotives were produced over a period of 21 years, from 1964 to 1985. Re 4/4·¥µ·¥µ·¥µ Subseries:·¥µ·¥µ·¥µ When S√ºdostbahn had the opportunity to buy one of the first batch of 50 Re 4/4·¥µ·¥µ locomotives before delivery, it had the gear modified for higher traction and lower speed for the steep routes of the SOB. This locomotive was delivered as number 41. Based on the SOB experience, the SBB ordered a batch of 20 Re 4/4·¥µ·¥µ·¥µ in 1969 for use on the Gotthard route
answer:
Which electric system has locomotive system [SBB-CFF-FFS Re 420]?


question:
original question: Which venue is the exhibition of [Asian/American/Modern Art: Shifting Currents, 1900‚Äì1970] in?
answer: m. h. de young memorial museum
answer type: Exhibition venue.
auxiliary information: Asian | American | Modern Art: Shifting Currents, 19001970 presents the work of artists of Asian ancestry who lived and worked in the United States. Nearly 100 works by 60 artists are included.
answer:
The exhibition of [Asian/American/Modern Art: Shifting Currents, 1900‚Äì1970] is in which venue?


question:
original question: Which star in category of [Red dwarf] has the minimum temperature?
answer: gj 1214
answer type: Star.
auxiliary information: A red dwarf is a small and relatively cool star on the main sequence, either late K or M spectral type. Red dwarfs range in mass from a low of 0.075 solar masses to about 0.50 M‚òâ and have a surface temperature of less than 4,000 K. Red dwarfs are by far the most common type of star in the Milky Way, at least in the neighborhood of the Sun, but because of their low luminosity, individual red dwarfs cannot easily be observed. From Earth, not one is visible to the naked eye. Proxima Centauri, the nearest star to the Sun, is a red dwarf, as are twenty of the next thirty nearest. According to some estimates, red dwarfs make up three-quarters of the stars in the Milky Way. Stellar models indicate that red dwarfs less than 0.35 M‚òâ are fully convective. Hence the helium produced by the thermonuclear fusion of hydrogen is constantly remixed throughout the star, avoiding a buildup at the core. Red dwarfs therefore develop very slowly, having a constant luminosity and spectral type for, in theory, some trillions of years, until their fuel is depleted. Because of the comparatively short age of the universe, no red dwarfs of advanced evolutionary stages exist.
answer:

Which [Red dwarf] star has the lowest temperature?