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Directions : (26 - 30) Read the passage given below and answer the following questions :

Oral administration of small doses of either progestogens or progestogen-estrogen combinations is another contraceptive method used by the females. They are used in the form of tablets and hence are popularly called the pills. Pills have to be taken daily for a period of 21 days starting preferably within the first five days of menstrual cycle. After a gap of 7 days during which menstruation occurs, it has to be repeated in the same pattern till the female desires to prevent conception. They inhibit ovulation and implantation as well as alter the quality of cervical mucus to prevent/ retard entry of sperms. Pills are very effective with lesser side effects and are well accepted by the females. Saheli the new oral contraceptive for the females contains a non-steroidal preparation called centchroman. It is a 'once a week' pill with very few side effects and high contraceptive value.

The present population of the world is estimated to be :

A) 500 million

B) 100 billion

C) 8 billion

D) 15 trillion