Does the sentence "After five years, the study concluded the patients saw a 35% reduction in their cholesterol, and their chances of dying of a heart attack were reduced by 42%." provide a valid answer to the question "How much did Zocor reduce the chance of dying from a heart attack?"

A: yes

Does the sentence "For over 30 years the National Archives have forbidden flash photography but the advent of cameras with automatic flashes have made the rules increasingly difficult to enforce." provide a valid answer to the question "What has made the no photography rule hard to enforce in the Rotunda for the Charters of Freedom?"

A: yes

Does the sentence "While the vertically integrated business model provided significant economies of scale and barriers to entry, each business now seeks to be a self-supporting unit without subsidies from other parts of the company." provide a valid answer to the question "One of the most important business in which Shell is involved is what?"

A: no

Does the sentence "Although the Japanese army initially successfully captured the city, the Chinese 57th division was able to pin them down long enough for reinforcements to arrive and encircle the Japanese." provide a valid answer to the question "What is the first river that the 40th, 3rd, and 6th Japanese divisions crossed while advancing southward?"

A:
no