Final answer:
The masculine nouns in the given list are tema, problema, mano.
Step-by-step explanation:
The masculine nouns in the given list are tema, problema, mano. In Spanish, nouns ending in -a are generally feminine, while nouns ending in -o are generally masculine. Therefore, chica and agua are feminine nouns, and día is an exception as it ends in -a but is also masculine.
Learn more about Gender of nouns in Spanish