Calcium cyanamide on treatment with steam produces:

• Correct answer
  A

  $\mathrm{C}\mathrm{a}\mathrm{C}{\mathrm{O}}_3+\mathrm{N}{\mathrm{H}}_3$
• B

  $\mathrm{C}\mathrm{a}\mathrm{H}\mathrm{C}{\mathrm{O}}_3+\mathrm{N}{\mathrm{H}}_3$
• C

  $\mathrm{C}\mathrm{a}\mathrm{O}+\mathrm{N}{\mathrm{H}}_3$
• D

  $\mathrm{C}\mathrm{a}(\mathrm{O}\mathrm{H}{)}_2+\mathrm{N}{\mathrm{H}}_3$

Hence, the correct answer is option: 'A'.