Which is the term that refers to the concentration (EC50) or dose (ED50) of a drug producing 50% of the maximal response of the drug?

Which of the following statements concerning the functions of the vagina is true?

a. The vagina allows the passage of a baby during delivery and the outflow of urine from the bladder. b. The vagina permits the outflow of menstrual blood and is the site at which a sperm fertilizes an egg. c. The vagina serves as a passageway for the fetus during delivery and an outlet for blood during menstruation. d. The vagina allows the excretion of urine from the bladder and the outflow of menstrual blood.

Crossover claims encourage an automatic rejection from the secondary payer for any claim the primary payer has rejected

Indicate whether the statement is true or false