Who was the first cricketer to score a century Sachin Tendulkar or Jacques Kallis?

Answer 1

Sachin Tendulkar's debut first-class century occurred in a match commencing on December 10, 1988. His debut Test century occurred in a match commencing on August 9, 1990.

Jacques Kallis' debut first-class century occurred in a match commencing on September 26, 1995. His debut Test century occurred in a match commencing on December 26, 1997.

It is of note that Sachin's debut first-class century occurred over six calendar years before the start of Jacques Kallis' debut first-class appearance.