What are the 227 monastic rules that fully ordained Buddhist monks in Thailand must follow called?

• A Vinaya
• B Sikkhapada
• C Dhamma
• D Patimokkha ✓

The Patimokkha is the code of 227 disciplinary rules binding on fully ordained Theravada monks (bhikkhus), recited fortnightly and covering proper conduct, possessions and offences.