Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R :

Assertion A : FSH acts upon ovarian follicles in female and Leydig cells in male.

Reason R : Growing ovarian follicles secrete estrogen in female while interstitial cells secrete androgen in male human being.

In the light of the above statements, choose the correct answer from the options given below :

The correct option is: A is false but R is true.

Step-by-step Explanation:

1. Evaluation of Assertion A:
Assertion A states: "FSH acts upon ovarian follicles in female and Leydig cells in male."
Let's analyze the action of FSH (Follicle-stimulating hormone) in both sexes:
- In females, FSH indeed acts upon the ovarian follicles to stimulate their growth and development.
- In males, however, FSH acts upon the Sertoli cells (sustentacular cells) of the testes to stimulate spermatogenesis and secretion of factors like androgen-binding protein (ABP). It is LH (Luteinizing Hormone, or interstitial cell-stimulating hormone - ICSH) that acts upon the Leydig cells (interstitial cells) to stimulate the synthesis and secretion of androgens (testosterone).
Therefore, Assertion A is false because FSH does not act upon Leydig cells in males.

2. Evaluation of Reason R:
Reason R states: "Growing ovarian follicles secrete estrogen in female while interstitial cells secrete androgen in male human being."
Let's analyze the secretory functions described:
- In females, the growing ovarian follicles (specifically the granulosa cells in cooperation with theca cells) synthesize and secrete estrogens (primarily estradiol).
- In males, the interstitial cells of Leydig (located in the connective tissue between seminiferous tubules) synthesize and secrete androgens (primarily testosterone).
Therefore, Reason R is true.

Conclusion:
Since Assertion A is false and Reason R is true, the correct choice is A is false but R is true.