Delvotest is a standard broad-spectrum microbial inhibitor ampoule/plate test utilizing Geobacillus stearothermophilus var. calidolactis as the indicator organism:

• Statement (I) is false: Delvotest-SP is specifically sensitive to and designed for beta-lactams (penicillins) and sulfonamides. It has very poor sensitivity for aminoglycosides such as Streptomycin (detection limit is far too high to detect regulatory levels of streptomycin). Hence, claiming it is used for Streptomycin is technically false.
• Statement (II) is true: Delvotest is universally accepted as a standard reference diffusion test for detecting penicillin and beta-lactam residues in herd and silo milk.
  
  Option analysis:
• Both Statement (I) and Statement (II) are true: Incorrect.
• Both Statement (I) and Statement (II) are false: Incorrect.
• Statement (I) is true but Statement (II) is false: Incorrect.
• Statement (I) is false but Statement (II) is true: Correct answer.