Problem: The so-called "grandmother hypothesis", based on studies of African hunter-gatherer groups, suggests that infertile women are vital for successful child-rearing despite being unable to produce children themselves.

Based on the paragraph above can we conclude that "The so-called "grandmother hypothesis" originated in the 1950s."?

A: It's impossible to say

Problem: How to braise lettuce<br>Prepare the lettuce. First take sweet romaine lettuce and discard any wilting or unhealthy looking leaves. Using a sharp knife, cut of stem off the lettuce.

Based on the paragraph above can we conclude that "If you don't have a sharp knife, use a dull one."?

A: It's impossible to say

Problem: Kasyanov was sacked by Putin in February 2004, after he had become critical of the Kremlin's politically motivated legal attack on the Yukos oil giant and its owner, billionaire Mikhail Khodorkovsky.

Based on the paragraph above can we conclude that "Kremlin's legal attack was what kasyanov loved and got fired for."?

A:
No