Question

Which of the following animals show menstrual cycle?

• A. Gorillas and chimpanzees
• B. Monkeys and humans
• C. Orangutans and monkeys
• D. All of these

Answer 1

The correct option is D All of these

Apart from humans, most of the other menstruating animals are primates, the group that includes monkeys and apes as well as humans. Menstrual bleeding is easily detectable in chimpanzees and gibbons. However, gorillas and orangutans bleed less copiously, so menstruation is only visible on closer inspection. Other primates, such as tarsiers, may also menstruate, but there is little hard evidence.

So, the correct option is 'All of these'.