Correct Option: A

Eggs are of 4 types regarding the amount of yolk present in them:
(i) Alecithal Egg: Almost free of yolk eg. most mammals like man.
(ii) Microlecithal Egg: Very small amount of yolk eg. Branchiostoma.
(iii) Mesolecithal Egg: Moderate amount of yolk eg. Frog’s egg
(iv) Macrolecithal Egg: Large amount of yolk eg. Reptiles, birds and egg-laying mammals.