The reaction of $N,N'$-diphenylthiourea with concentrated $HCl$ upon heating is given by:
$(C_6H_5NH)_2C=S \xrightarrow{conc. HCl, Heat} A + B$
The unknown compounds $A$ and $B$ in the above reaction are:

• A
  Phenyl mercaptan and aniline
• B
  Thiophenol and aniline hydrochloride
• C
  $C_6H_5-N=C=S$ and $C_6H_5NH_3^+Cl^-$
• D
  $C_6H_5CH_2SH$ and $C_6H_5NH_3^+Cl^-$