Does the sentence "Knowledge of Sanskrit was a marker of social class and educational attainment in ancient India, and the language was taught mainly to members of the higher castes through the close analysis of Vyakaranins such as Panini and Patanjali, who exhorted proper Sanskrit at all times, especially during ritual." provide a valid answer to the question "Of what was Sanskrit once thought to be a divider?"

A: yes

Does the sentence "Hugh Edward Richardson writes that the Ming dynasty exercised no authority over the succession of Tibetan ruling families, the Phagmodru (13541435), Rinpungpa (14351565), and Tsangpa (15651642)." provide a valid answer to the question "What years did the Tsangpa start and end?"

A: yes

Does the sentence "Serbia was created by the Serbian Revolution, 18151833." provide a valid answer to the question "When was the Serbian Revolution?"

A: yes

Does the sentence "On 4 August Russian scouts saw a movement which they thought was the start of a withdrawal, the Russians advanced and the Turks attacked first." provide a valid answer to the question "Who make the Turks retreat back to Batum?"

A:
no