What is the name of the compound shown?

Aspiro[4.4]nonane
Bspiro[3.5]nonane
Cspiro[5.3]nonane
Dspiro[2.6]nonane

Answer: A

The compound is spiro[4.4]nonane. The single spiro carbon joins two five-membered rings, each contributing 4 other carbons, so the descriptor is [4.4] and the total is 9 carbons (nonane).

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