The pituitary hormone that stimulates the interstitial cells to secrete testosterone is?

The correct answer is luteinizing hormone (LH).

LH, also known as interstitial cell-stimulating hormone (ICSH) in males, is a hormone produced by the pituitary gland. In males, LH stimulates the interstitial cells of the testes to secrete testosterone, which is responsible for the development and maintenance of male characteristics.