Primary sex organ is
A.Ovary/Testis
B.Uterus/Seminal vesicle
C.Breast/Beard
D.Spermatic cord

Hint- In this particular type of question we need to understand the human sex organs especially the primary sex organs in male and female and state them individually to get the desired answer.

Complete step-by-step answer:
Sex organ (or reproductive organ) is any part of an animal's body that is involved in sexual reproduction. The reproductive organs together constitute the reproductive system. A primary sex organ is an organ which produces gametes-sperms in male and ova in the female. This is done by testis in males and ovary in females. So, they are known as primary sex organs in humans. So, the answer is option A.

Note-Remember that in the case of male reproductive system the primary sex organs are a pair of testes (singular: testis) lying outside the abdominal cavity, enclosed in a sac called the scrotum. The placement of testes outside the body results in the temperature of the testes being lower than that of the rest of the body, a condition favorable to produce healthy sperms.
Primary sex organs in a female consist of a pair of ovaries which are oval bodies lying at the back of the abdomen below the kidney. Each ovary consists of many ovarian follicles. Each follicle can produce an egg.