Out of the following animals , how many show the oestrous cycle ?
[Lizard , Lion , Goat , Rat , Human , Apes , Monkeys]

Options

A. Four
B. Five
C. Two
D. Three

Answer

To determine how many of the listed animals show the oestrous cycle, we need to analyze each animal based on their reproductive cycles.

### Step-by-Step Solution:

1. **Understanding the Oestrous Cycle**:
- The oestrous cycle is a reproductive cycle found in many non-primates, characterized by a period of heat (oestrus) during which the female is receptive to mating. This cycle does not involve menstrual bleeding, which is a key feature of the menstrual cycle found in humans and some primates.

2. **List of Animals**:
- The animals listed are: Lizard, Lion, Goat, Rat, Human, Apes, and Monkeys.

3. **Analyzing Each Animal**:
- **Lizard**: Lizards do not have an oestrous cycle; they reproduce through different mechanisms and do not exhibit a defined oestrous cycle.
- **Lion**: Lions do show an oestrous cycle, as they are mammals that experience a heat period.
- **Goat**: Goats also exhibit an oestrous cycle, making them a part of this category.
- **Rat**: Rats are known to have an oestrous cycle, characterized by a recurring heat period.
- **Human**: Humans do not show an oestrous cycle; instead, they have a menstrual cycle.
- **Apes**: Similar to humans, apes have a menstrual cycle and do not exhibit an oestrous cycle.
- **Monkeys**: Monkeys also have a menstrual cycle and do not show an oestrous cycle.

4. **Counting the Animals with Oestrous Cycles**:
- From the analysis:
- Lion: Yes
- Goat: Yes
- Rat: Yes
- Lizard: No
- Human: No
- Apes: No
- Monkeys: No
- The animals that show the oestrous cycle are Lion, Goat, and Rat.

5. **Final Count**:
- Total animals showing the oestrous cycle = 3 (Lion, Goat, Rat).

### Conclusion:
The answer to the question is **3**.