What is true for "Lactational amenorrhoea"?

I. It means absence of menstruation

II. Ovulation does not occur during the lactational period

III. Chances of failure of contraception are almost nil upto six months following parturition

IV. Side effects are almost nil

V. Contraceptive efficiency reduces after the period of intense lactation

VI. It is a natural method of contraception

VII. It increases phagocytosis of sperms

(1) II, III, IV, V, VI

(2) All except VII

(3) II, III, IV, V

(4) All of the above

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