Read the following statements and find out the correct statement.
$a$. Urinary bladder is absent in fishes
$b$. Gambusia fish eradicates mosquito larva
$c$. Ampulla of Lorenzini present in dogfish act as thermoreceptors
$d$. Electric organs are modified muscles

  • A
    $b$ and $d$
  • B
    $a$ and $c$
  • C
    $b$ only
  • D
    $a, b, c$ and $d$

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