1 Pa. Code § 35.38
Respondents seeking relief against other parties in a proceeding by reason of the presence of common questions of law or fact shall set forth in their answer the facts constituting the grounds of complaint; the provisions of the statutes, rules, regulations or orders relied upon; the injury complained of; and the relief sought. The answer shall in all other respects conform to the requirements of this part for answers generally.
1 Pa. Code § 35.38
This section cited in 7 Pa. Code §179.14 (relating to answers to complaints, petitions, motions and other filings requiring a response); 12 Pa. Code §11.9 (relating to answers to complaints and petitions); 34 Pa. Code §111.15 (relating to no other pleadings allowed); 34 Pa. Code §131.33 (relating to answers except answers to petitions for joinder and challenge proceedings); 34 Pa. Code §131.121 (relating to penalty proceedings initiated by a party); 40 Pa. Code §17.13 (relating to protests/intervention procedure); 52 Pa. Code §1005.42 (relating to answers seeking affirmative relief or raising new matter); 58 Pa. Code §493a.5 (relating to answers to complaints, petitions, motions and other filings requiring a response); and 61 Pa. Code §703.2 (relating to petition content).