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Contraceptive efficiency can be increased when

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coitus occurs between 10-17 days of menstrual cycle

pills are consumed orally only during menstruation

emergency contraceptives are used after 72 hours of coitus

spermicidal creams are used along with the barriers

answer is D.

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Detailed Solution

Spermicidal creams, jellies and foams are usually used along with the barriers increase their contraceptive efficiency.

Emergency contraceptives are effective within 72 hours after coitus.

Sexual intercourse must be prevented between 10-17 days of menstrual cycle to avoid pregnancy.

Pills must be consumed for 21 days starting on any day of menstruation.

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