Teacher:Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Teacher: Now, understand the problem? Solve this instance: Context : FF DIN is a realist sans-serif typeface designed in 1995 by Albert-Jan Pool, based on DIN-Mittelschrift and DIN-Engschrift, as defined in the German standard DIN 1451.
Answer : DIN 1451
Student:
Which is the basis of FF DIN?