What is "2D:4D?"
A)The ratio of one's index finger length (2nd digit) to their ring finger length (4th digit).
B)The ratio at which dopamine receptors fire in the 2nd cerebral lobe to the 4th cerebral lobe.
C)The ratio of sexual dimorphism in twins (2) to that of quadruplets (4)
D)The rate of androgen release in the second trimester of pregnancy (2) to the first "trimester" of life after birth (4).

Question

What is "2D:4D?" 
A)The ratio of one's index finger length (2nd digit) to their ring finger length (4th digit). 
B)The ratio at which dopamine receptors fire in the 2nd cerebral lobe to the 4th cerebral lobe. 
C)The ratio of sexual dimorphism in twins (2) to that of quadruplets (4) 
D)The rate of androgen release in the second trimester of pregnancy (2) to the first "trimester" of life after birth (4).

Quizplus · Accepted Answer

2D:4D refers to the ratio of the length of one's index finger (2nd digit) to their ring finger (4th digit). This ratio has been linked to prenatal exposure to androgens and has been studied as a potential indicator of various physical and behavioral traits.

What Is "2D:4D