Which outcome arises in photodynamic therapy when photosensitizer molecules reach a specific energy threshold?

A)Singlet oxygen generates cytotoxicity✓

B)Photosensitizer undergoes fluorescence quenching

C)Triplet state intersystem crossing ceases

D)Photoisomerization improves drug targeting

💡 Explanation

Singlet oxygen creates cytotoxicity because energy transfer from the therapy's photosensitizer molecules results in singlet oxygen production via intersystem crossing. The high reactivity of singlet oxygen kills target cells; therefore, this leads to therapeutic effect, rather than the other stated possibilities.

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Which outcome arises in photodynamic therapy when photosensitizer molecules reach a specific energy threshold?

💡 Explanation

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