Conversation of students with lecturer

Lecturer = L
Student = S

L:" Students, so what is the answer for Question2?"
S(a few students with not so loud but pekak also can hear):"powder(assume this is the answer la)."

L:"Ya, so students, can you give me the answer of Question2?"
S(a bit louder):"POWDER (beh song already lo apparently)"

L:"Okay students, please give me the answer for Question2."
S(LOUDLY):"P-O-W-D-E-R!"

L:"Come you, Student A, please give me the answer."
S:" What the fcuk =.="

I don't know what's wrong with the lecturer. I really don't know. But students seriously wanna know.