instruction:
In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.
question:
Who played jane tennison in prime suspect 1973?
answer:
Stefanie Martini


question:
Journal of optics a pure and applied optics abbreviation?
answer:
J. Opt.


question:
The constitutional convention of 1787 in philadelphia occurred in which century?
answer:

18th century