Does the sentence "A complex tone composed of two sine waves of 1000 and 1200 Hz may sometimes be heard as up to three pitches: two spectral pitches at 1000 and 1200 Hz, derived from the physical frequencies of the pure tones, and the combination tone at 200 Hz, corresponding to the repetition rate of the waveform." provide a valid answer to the question "The pitch of complex tones can be?"

A: no

Does the sentence "In May 2005, Lee made an uncharacteristic appearance at the Los Angeles Public Library at the request of Peck's widow Veronique, who said of Lee: "She's like a national treasure." provide a valid answer to the question "What did Peck's widow call Lee?"

A: yes

Does the sentence "One of his descendants, Charles Martel (d. 741), won the Battle of Poitiers in 732, halting the advance of Muslim armies across the Pyrenees.[K]" provide a valid answer to the question "What leader was victorious at the Battle of Poitiers?"

A: yes

Does the sentence "Fryderyk's father, Nicolas Chopin, was a Frenchman from Lorraine who had emigrated to Poland in 1787 at the age of sixteen." provide a valid answer to the question "From where id Chopin's father emigrate from?"

A:
yes