Number of people in a group needed to make the probability of at least two of them sharing a birthday is over 50% or the number of people on a soccer field (that are supposed to be there) at time.
What is 23?
100
The genotype of somebody with Type O blood.
What is oo?
100
The shared first name of co-founders of Oracle, Google, and Wikipedia.
What is Larry?
100
The class of drugs that marijuana is in.
What is psychoactive?
100
The river that runs through the capital of the U.S.
What is the Potomac River?
200
The number of countries on Ireland.
What is two? (Republic of Ireland, United Kingdom)
200
Co-host and winner of the 2011 world cup.
What is India?
200
An excavation or pit, usually open to the air, from which building stone, slate, or the like, is obtained by cutting, blasting, etc.