The correct option is A Guava- Pericarp with thalamus fused
Guava has pericarp with fused thalamus. Guava is an example of accessory fruit is a fruit in which some of the flesh is derived not from the ovary but from some adjacent tissue exterior to the carpel. The fruit is composed of the receptacle or upper end of the flower-stalk greatly dilated. Enclosed within its cellular flesh is the true fruit: five cartilaginous carpels, known colloquially as the core.
Therefore, the correct answer is option A.