It appears that teenage girls and young women in their early 20s are especially susceptible to chlamydia infection, largely because their have not fully matured.

The correct answer would be, Cervixes.

Explanation:

Chlamydia is a disease which is a Sexually Transmitted Disease and is caused by the sexual interaction of man and woman. It is a bacterial infection caused by the bacteria Chlamydia. Teenage girls or girls in the early twenty's are seen to be more susceptible Chlamydia Infection. This is because of the fact that the Cervixes of young girls have not fully matured till this age and they are more prone to get infection like this. So it is always advised to stay away from sexual interactions in the early age.

answer; lead-based paint;