<human>: Q: What type of pump appeared in the 15th century?
 A: In the medieval Middle Eastern world, the physicist and Islamic scholar, Al-Farabi (Alpharabius, 872–950), conducted a small experiment concerning the existence of vacuum, in which he investigated handheld plungers in water.[unreliable source?]
 Does the answer correctly answer the question

OPTIONS:
- yes
- no
<bot>: no