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The duration 19-21 days refers to:
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- incubation period of hen’s egg
- average life-span of a red blood cell in humans
- the period of menstrual cycle soon after menstruation, during which fertilisation is most likely to occur
- period of completion of one schizogony cycle of malarial parasite inside a red blood cell
- incubation period of hen’s egg
Correct Option: C
The menstrual cycle is the scientific term for the physiological changes that occur in fertile women and other female primates for the purposes of sexual reproduction. It takes approximately 28 days to complete although this does vary from person to person. Length variation between eight and 20 days is considered as moderately irregular cycles. Variation of 21 days or more between a woman's shortest and longest cycle lengths is considered very irregular
