Which of the following statements are true/false?
$(i)$ In $Torpedo$,the electric organs are capable of generating strong electric shock to paralyze the prey.
$(ii)$ Bony fishes use pectoral,pelvic,dorsal,anal,and caudal fins in swimming.
$(iii)$ Amphibian skin is moist and has thick scales.
$(iv)$ Birds are poikilothermic animals.
$(v)$ The most unique mammalian characteristic is the presence of milk-producing mammary glands by which the young ones are nourished.

• A
  $(i), (ii)$ and $(iii)$ are true; $(iv), (v)$ are false
• B
  $(i), (ii)$ and $(v)$ are true; $(iii)$ and $(iv)$ are false
• C
  $(i), (iv)$ and $(v)$ are true; $(ii)$ and $(iii)$ are false
• D
  $(i), (ii)$ and $(iv)$ are false; $(iii)$ and $(v)$ are true