Problem: Does "Not all wavelengths of visible electromagnetic energy are equally effective at stimulating the human eye; the luminous efficacy of radiant energy (LER) is a measure of how well the distribution of energy matches the perception of the eye." answer the question "In how many ways can one define luminous efficacy of a light source?" OPTIONS:
- yes
- no

A: no

Problem: Does "The Dutch written grammar has simplified over the past 100 years: cases are now mainly used for the pronouns, such as ik (I), mij, me (me), mijn (my), wie (who), wiens (whose: masculine or neuter singular), wier (whose: feminine singular; masculine, feminine or neuter plural)." answer the question "Over what span of time have the rules for written Dutch become less complicated?" OPTIONS:
- yes
- no

A: yes

Problem: Does "John had five legitimate children, all by Isabella." answer the question "How many legitimate children did John have?" OPTIONS:
- yes
- no

A:
yes