Text: Its ruler, Chandragupta Maurya (321 297 b.c. ), was also to become the founder of India's first imperial dynasty with Pataliputra (modern Patna), the world's largest city at the time, as its capital.
Entailment: Pataliputra was, at that time, the world's largest city.
Contradiction: Pataliputra was a small, historically insignificant village in India.