Does the sentence "By late 1949, the PLA was pursuing remnants of KMT forces southwards in southern China, and only Tibet was left." provide a valid answer to the question "When was the People's Republic of China formed?" OPTIONS:
- yes
- no

A: no

Does the sentence "With the development of the modern evolutionary synthesis in the 1930s and 1940s, Darwin's concept of evolutionary adaptation through natural selection became central to modern evolutionary theory, and it has now become the unifying concept of the life sciences." provide a valid answer to the question "When did Darwin's concept of evolution become widely believed and central to the modern theory of evolution?" OPTIONS:
- yes
- no

A: yes

Does the sentence "They also served as a surveillance system, aiding the security services in locating individuals with views critical of the RCC, leading to the arrest of Ba'athists, Marxists and Islamists." provide a valid answer to the question "Along with Ba'athists and Islamists, who was arrested as a result of the actions of the People's Committees?" OPTIONS:
- yes
- no

A: yes

Does the sentence "In the Balkans, the Ottoman Empire, a Turkish state originating in Anatolia, encroached steadily on former Byzantine lands, culminating in the Fall of Constantinople in 1453." provide a valid answer to the question "When did the Ottoman Empire conquer Constantinople?" OPTIONS:
- yes
- no

A:
yes