question: OPTIONS:
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Building on the extensive earlier work of Alphonse de Candolle, Nikolai Vavilov (18871943) produced accounts of the biogeography, centres of origin, and evolutionary history of economic plants.
Whose earlier work did Nicholas Vavilov build upon?

answer: yes

[Q]: Sentence: The locomotives carried a four-pole rotating phase converter feeding a single traction motor of the polyphase induction type at 600 to 1,100 V. Question: What type of the converter was used in hungarian locomotives of that time? OPTIONS:
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++++++++++
[A]: yes

Q: Does "In 1846, the United States went to war against Mexico and sent a naval and land expedition to conquer Alta California." provide a valid answer to "Who commissioned Captain Archibald Gillespie to lead 50 men on horseback to the north?"?
OPTIONS:
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A: no

Problem: Does "The show featured eight a cappella groups from the United States and Puerto Rico vying for the prize of $100,000 and a recording contract with Epic Records/Sony Music." answer the question "What popular a capella competition is not specific to college groups?" OPTIONS:
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A: no

Does the sentence "Effective verbal or spoken communication is dependent on a number of factors and cannot be fully isolated from other important interpersonal skills such as non-verbal communication, listening skills and clarification." provide a valid answer to the question "When does language learning primarily occur most intensively?" OPTIONS:
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A: no

Does the sentence "Some systems are capable of multipoint conferencing with no MCU, stand-alone, embedded or otherwise." provide a valid answer to the question "What do systems with no MCU use in order to perform multipoint conferencing?" OPTIONS:
- yes
- no

A:
no