Which of the following is not true about phosphine?

Phosphine is a colorless gas Phosphine has a rotten fish smell Phosphine is inflammable Phosphine is highly poisonous

Phosphine is inflammable

Phosphine is a colorless gas with rotten fish smell and is highly poisonous. In pure state, phosphine is non-flammable but becomes inflammable owing to the presence of P2H4 or White phosphorous (P4) vapours.