Identify from the following group of animals which exhibit oestrus cycle

Options

A. Monkey, ape, man and elephant
B. Lion, deer, dog and cow
C. Lion, dog, monkey and ape
D. Cow, monkey, elephant and ape

Answer

To solve the question of which group of animals exhibits the oestrus cycle, we can follow these steps:

### Step 1: Understand the Oestrus Cycle
The oestrus cycle is a reproductive cycle that occurs in non-primate mammals. It is characterized by specific periods of fertility and is different from the menstrual cycle, which occurs in primates.

### Step 2: Identify the Types of Animals
We need to differentiate between primates and non-primates:
- **Primates**: This group includes monkeys, apes, and humans. They exhibit the menstrual cycle.
- **Non-primates**: This group includes animals like lions, deer, dogs, and cows. They exhibit the oestrus cycle.

### Step 3: Analyze the Options
Now, let's evaluate the options provided:
1. **Monkey, Ape, Man, and Elephant**: All of these are primates (except the elephant, which is a non-primate but does not exhibit the oestrus cycle). This option is incorrect.
2. **Lion, Deer, Dog, and Cow**: All of these are non-primates and exhibit the oestrus cycle. This option is correct.
3. **Lion, Dog, Monkey, and Ape**: This option includes monkeys and apes (primates), making it incorrect.
4. **Cow, Monkey, Elephant, and Ape**: This option also includes monkeys and apes (primates), making it incorrect.

### Step 4: Conclusion
After analyzing all the options, the only group of animals that exhibits the oestrus cycle is the second option: **Lion, Deer, Dog, and Cow**.

### Final Answer
The correct answer is: **Lion, Deer, Dog, and Cow**.

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