Which of the following options is associated with the class of cold-blooded animals?

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Step-by-step reasoning:

1. Definition: Cold-blooded animals are ectothermic — they rely on external sources to regulate body temperature.

2. Classify each option:
   - $1$ Chameleon: a reptile (ectotherm) — cold-blooded.
   - $2$ Pavo (peafowl): a bird — endotherm (warm-blooded).
   - $3$ Macropus (kangaroo): a mammal — endotherm (warm-blooded).
   - $4$ Psittacula (parrot genus): a bird — endotherm (warm-blooded).

3. Conclusion: Only $1$ (Chameleon) is cold-blooded, so the correct choice is option a.

FINAL_ANSWER: a

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