An organic compound (A) having molecular formula `C_6H_6O` gives a characteristic colour with aqueous `FeCI_3` solution. (A) on treatment with `CO_2` and NaOH at 400 K under pressure gives (B), which on acidification gives a compound (C). The compound (C) reacts with acetyl chloride to give (D) which is a popular pain killer.
Compound (C) is ?

Options

A. salicylic acid
B. salicyladehyde
C. benzoic acid
D. benzaldehyde

Answer

A