At which age do children began to know the difference between reality and pretending?

A teenager runs to get in line to take a ride on The Raven, one of the country's top rollercoasters. The ride is more than he anticipated and he is a bit dizzy. Which structure was most responsible for this feeling?

a) eyes b) pinna c) Merkel disks d) semicircular canals

According to ancient Chinese folklore, how can one predict if they are having a boy?

a. If the mother's age and the month of conception are both even or odd. b. If a woman is carrying her pregnancy low in her abdomen. c. If her right breast is larger than her left. d. If craves salty and sour food.