Which fish,thought for a long time to be extinct until it appeared in a South African fish market in 1938,is also suspected to be related to the ancestral fish that gave rise to the first tetrapod?

Question

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The fish referred to in the question is the coelacanth. It was thought to be extinct for millions of years until it was discovered in a South African fish market in 1938. This fish is also suspected to be related to the ancestral fish that gave rise to the first tetrapod, which were four-limbed vertebrates that eventually evolved into land animals. The lungfish (A) is also an ancient fish that has both gills and lungs, but it was not thought to be extinct and is not as closely related to tetrapods as the coelacanth. Coelatroph (C) and Golden koi (D) are not actual fish species.

Which Fish,thought for a Long Time to Be Extinct Until