This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

[Q]: Passage: Reflections generally affect polarization. For radio waves, one important reflector is the ionosphere which can change the wave's polarization. Thus for signals received following reflection by the ionosphere (a skywave), a consistent polarization cannot be expected. For line-of-sight communications or ground wave propagation, horizontally or vertically polarized transmissions generally remain in about the same polarization state at the receiving location. Matching the receiving antenna's polarization to that of the transmitter can make a very substantial difference in received signal strength. Question: What reflector can change the waves polarization?
[A]: ionosphere


[Q]: Passage: The President, who is elected to a five-year term, has an executive role: the current President is Aníbal Cavaco Silva. The Assembly of the Republic is a single chamber parliament composed of 230 deputies elected for a four-year term. The Government is headed by the Prime Minister (currently António Costa) and includes Ministers and Secretaries of State. The Courts are organized into several levels, among the judicial, administrative and fiscal branches. The Supreme Courts are institutions of last resort/appeal. A thirteen-member Constitutional Court oversees the constitutionality of the laws. Question: How many members sit on the Constitutional Court?
[A]: thirteen


[Q]: Passage: Older or stripped-down systems may support only the TZ values required by POSIX, which specify at most one start and end rule explicitly in the value. For example, TZ='EST5EDT,M3.2.0/02:00,M11.1.0/02:00' specifies time for the eastern United States starting in 2007. Such a TZ value must be changed whenever DST rules change, and the new value applies to all years, mishandling some older timestamps. Question: What's might a new TZ value mishandle when it changes with new DST rules?
[A]:
older timestamps