Step 1: Envagai Thervu = Eight Diagnostic Tools: Nadi, Sparisam (touch), Niram (color), Mozhi (speech), Vizhi (eyes), Malam (stool), Moothiram (urine), and Naadi (pulse).
Step 2: Naadi Pariksha is the Sanskrit name; Siddha uses “Nadi”.
Step 3: So, Naadi Pariksha is not listed separately — hence option (C) is correct.