Coal tar is a known human carcinogen. It contains potent carcinogens like benzo(a)pyrene, benz(a)anthracene, and dibenz(a,h)anthracene.

Fractional distillation of coal tar is a process that produces aromatic hydrocarbons like benzene, creosotes, naphthalene, anthracene, carbolic and cresylic acids, pyridine, and pitch. Benzene is used in the pharmaceutical industry as a solvent and in the synthesis of drugs such as cyclohexane, phenol etc.Thus the correct answer is option B- Benzene