Conversation so far:
What day was Isaac Asimov born on?
Isaac Asimov was born in Petrovichi, Smolensk Oblast, Russian SFSR on an unknown date between October 4, 1919 and January 2, 1920.
What is the closest date to Isaac Asimov's birthday?
01/02/1920
What day did Isaac Asimov choose?
Isaac Asimov celebrated his birthday on January 2.
What was Isaac Asimov's mothers name?
Anna Rachel
What is Isaac Asimov's fathers name?
Judah Asimov
Where are Isaac Asimov's parents from?
Russia
What tragedy did Isaac Asimov's family face?
Isaac Asimov and 16 other children in Petrovichi developed double pneumonia.

Question: what year was this
Self-contained rewrite: what year did Isaac Asimov develop pneumonia?