Does the sentence "One of the key concerns of older adults is the experience of memory loss, especially as it is one of the hallmark symptoms of Alzheimer's disease." provide a valid answer to the question "Which part of the brain is associated with the memory loss an elderly person suffers?"

A: no

Does the sentence "This was the largest liquidity injection into the credit market, and the largest monetary policy action, in world history." provide a valid answer to the question "In October 2010, who was the Nobel laureate that explained how the U.S. Federal Reserve was creating currency to combat the liquidity trap?"

A: no

Does the sentence "It is widely believed that activity-dependent modification of synapses is the brain's primary mechanism for learning and memory." provide a valid answer to the question "How many synapses does the human brain supposedly contain?"

A: no

Does the sentence "After a new wave of UN sanctions, on 11 March 2013, North Korea claimed that it had invalidated the 1953 armistice." provide a valid answer to the question "Why is North Korea insisting that the 1953 armistice was violated?"

A:
yes